Compositions and methods for inhibition of expression of protein C (PROC) genes

ABSTRACT

The invention relates to double-stranded ribonucleic acid (dsRNA) targeting a PROC gene, and methods of using the dsRNA to inhibit expression of PROC. At least one nucleotide of the dsRNA can be a modified nucleotide, e.g., a 2-0-methyl modified nucleotide, a nucleotide comprising a 5′-phosphorothioate group, and a terminal nucleotide linked to a cholesteryl derivative or dodecanoic acid bisdecylamide group. Other examples of modified nucleotides include a 2′-deoxy-2′-fluoro modified nucleotide, a 2′-deoxymodified nucleotide, a locked nucleotide, an abasic nucleotide, 2′-amino-modified nucleotide, 2′-alkyl-modified nucleotide, morpholino nucleotide, a phosphoramidate, and a non-natural base comprising nucleotide. A dsRNA of the invention can include one or more of any of these modified nucleotides.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority to U.S. Application Ser. No. 61/499,620, filed on Jun. 21, 2011, U.S. Application Ser. No. 61/542,729, filed on Oct. 3, 2011, and U.S. Application Ser. No. 61/615,010, filed on Mar. 23, 2012. The entire contents of each of these provisional applications are hereby incorporated by reference.

REFERENCE TO SEQUENCE LISTING

This application includes a Sequence Listing submitted electronically as a text file named 21248US _CRF _sequencelisting.txt, created on Dec. 17, 2013, with a size of 147,456 bytes. The sequence listing is incorporated by reference.

FIELD OF THE INVENTION

The invention relates to double-stranded ribonucleic acid (dsRNA) targeting PROC genes, and methods of using the dsRNA to inhibit expression of PROC.

BACKGROUND OF THE INVENTION

Hemophilia patients suffer from increased bleeding due to deficiencies in coagulation cascade factors such as Factor VIII (Hemophilia A), Factor IX (Hemophilia B), and Factor XI (Hemophilia C). There is a large unmet need for treatment of hemophilia patients, including those currently treated with recombinant FVIII, e.g., “inhibitor” patients. Some but not all hemophilia A patients with Factor V Leiden mutation have significantly milder disease with reduced bleeding episodes, arthropathy and rFVIII requirements (reviewed Franchini and Lippi, Thromb Res, 2010). Some patients with a Factor V Leiden mutation have activated Protein C resistance. (Nichols et al. (1996) Moderation of hemophilia A phenotype by the factor V R506Q mutation. Blood 88:1183).

Protein C (autoprothrombin IIA and blood coagulation factor XIV) is a zymogene encoded by the PROC gene. Greater than 85% of circulating Protein C is in the zymogene form. After cleavage by thrombin, activated Protein C (APC) is a serine protease with anticoagulant and cytoprotective functions. The half-life of APC is only 15 minutes.

Double-stranded RNA molecules (dsRNA) have been shown to block gene expression in a highly conserved regulatory mechanism known as RNA interference (RNAi). WO 99/32619 (Fire et al.) discloses the use of a dsRNA of at least 25 nucleotides in length to inhibit the expression of genes in C. elegans. dsRNA has also been shown to degrade target RNA in other organisms, including plants (see, e.g., WO 99/53050, Waterhouse et al.; and WO 99/61631, Heifetz et al.), Drosophila (see, e.g., Yang, D., et al., Curr. Biol. (2000) 10:1191-1200), and mammals (see WO 00/44895, Limmer; and DE 101 00 586.5, Kreutzer et al.).

SUMMARY OF THE INVENTION

Described herein double-stranded ribonucleic acid (dsRNA) for inhibiting expression of a Protein C (PROC) gene. The dsRNA has a sense strand and an antisense strand each 30 nucleotides or less in length, and the antisense strand comprises at least 15 contiguous nucleotides of an antisense sequence in Table 1 or Table 2. In some embodiments the sense strand sequence is selected from Table 1 or Table 2, and the antisense strand is selected from Table 1 or Table 2.

At least one nucleotide of the dsRNA can be a modified nucleotide, e.g., a 2′-β-methyl modified nucleotide, a nucleotide comprising a 5′-phosphorothioate group, and a terminal nucleotide linked to a cholesteryl derivative or dodecanoic acid bisdecylamide group. Other examples of modified nucleotides include a 2′-deoxy-2′-fluoro modified nucleotide, a 2′-deoxy-modified nucleotide, a locked nucleotide, an abasic nucleotide, 2′-amino-modified nucleotide, 2′-alkyl-modified nucleotide, morpholino nucleotide, a phosphoramidate, and a non-natural base comprising nucleotide. A dsRNA of the invention can include one or more of any of these modified nucleotides.

A dsRNA of the invention can include at least one 3′ overhang of at least 1 nucleotide. In some embodiments, each strand of the dsRNA includes a 3′ overhang of at 2 nucleotides.

A dsRNA of the invention can include a ligand. In some embodiments, the ligand is conjugated to the 3′ end of the sense strand of the dsRNA. In some embodiments, the ligand-conjugated sense strand sequence is selected from Table 8 or Table 9, and the antisense strand is selected from Table 8 or Table 9.

The invention also includes a cell comprising the dsRNA of the invention, a vector encoding at least one strand of the dsRNA of the invention, and a cell comprising a vector encoding at least one strand of the dsRNA of the invention.

The invention also includes a pharmaceutical composition for inhibiting expression of a PROC gene, having any of the dsRNA described herein and a pharmaceutical excipient. In some embodiments, the pharmaceutical composition includes a lipid formulation.

Methods of inhibiting PROC expression in a cell are also included in the invention. In one embodiment, the method includes contacting the cell with a dsRNA targeting a PROC gene and maintaining the cell produced for a time sufficient to obtain degradation of the mRNA transcript of a PROC gene, thereby inhibiting expression of the PROC gene in the cell. In some embodiments the PROC expression is inhibited by at least 40%.

In another embodiment, the method includes treating a disorder mediated by PROC expression by administering to a human in need of such treatment a therapeutically effective amount of the PROC dsRNA of the invention. Included are methods of treatment for hemophilia.

The dsRNA of the invention can be AD-48953, or a dsRNA having an antisense strand comprising at least 15 contiguous nucleotides of the antisense strand of AD-48953. In another embodiment, the dsRNA of the invention can be AD-48878, or a dsRNA have an antisense strand comprising at least 15 contiguous nucleotides of the antisense strand of AD-48878. In another embodiment, the dsRNA of the invention can be AD-48898, or a dsRNA comprising at least 15 contiguous nucleotides of the antisense strand of AD-48898.

In another embodiment, the dsRNA of the invention can be AD-56164.1, or a dsRNA having an antisense strand comprising at least 15 contiguous nucleotides of the antisense strand of AD-56164.1. In another embodiment, the modified dsRNA of the invention can be AD-56165.1, or a dsRNA having at least 15 contiguous nucleotides of the antisense strand of AD-56165.1.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph showing the effect on target mRNA levels in mice after treatment with siRNA targeting PROC (AD-48926 and AD-48953).

FIG. 2 is a graph demonstrating the duration of inhibition of mRNA levels in mice after treatment with siRNA targeting PROC (AD-48953).

FIG. 3 is the structure of GALNAc3.

FIG. 4 shows the structure of an siRNA conjugated to Chol-p-(GalNAc)3 via phosphate linkage at the 3′ end.

FIG. 5 shows the structure of an siRNA conjugated to LCO(GalNAc)3 (a (GalNAc)3-3′-Lithocholic-oleoyl siRNA Conjugate).

DETAILED DESCRIPTION OF THE INVENTION

The details of one or more embodiments of the invention are set forth in the description below. Other features, objects, and advantages of the invention will be apparent from the description and the drawings, and from the claims.

The invention provides dsRNAs and methods of using the dsRNAs for inhibiting the expression of a PROC gene in a cell or a mammal where the dsRNA targets a PROC gene. The invention also provides compositions and methods for treating pathological conditions and diseases in a mammal caused by the expression of a PROC gene, e.g., hemophilia. A PROC dsRNA directs the sequence-specific degradation of PROC mRNA.

I. Definitions

For convenience, the meaning of certain terms and phrases used in the specification, examples, and appended claims, are provided below. If there is an apparent discrepancy between the usage of a term in other parts of this specification and its definition provided in this section, the definition in this section shall prevail.

“G,” “C,” “A” and “U” each generally stand for a nucleotide that contains guanine, cytosine, adenine, and uracil as a base, respectively. “T” and “dT” are used interchangeably herein and refer to a deoxyribonucleotide wherein the nucleobase is thymine, e.g., deoxyribothymine. However, it will be understood that the term “ribonucleotide” or “nucleotide” or “deoxyribonucleotide” can also refer to a modified nucleotide, as further detailed below, or a surrogate replacement moiety. The skilled person is well aware that guanine, cytosine, adenine, and uracil may be replaced by other moieties without substantially altering the base pairing properties of an oligonucleotide comprising a nucleotide bearing such replacement moiety. For example, without limitation, a nucleotide comprising inosine as its base may base pair with nucleotides containing adenine, cytosine, or uracil. Hence, nucleotides containing uracil, guanine, or adenine may be replaced in the nucleotide sequences of the invention by a nucleotide containing, for example, inosine. Sequences comprising such replacement moieties are embodiments of the invention.

“PROC” refers to the protein C gene. According to the NCBI NLM website, this gene encodes a vitamin K-dependent plasma glycoprotein. The encoded protein is cleaved to its activated form by the thrombin-thrombomodulin complex. This activated form contains a serine protease domain and functions in degradation of the activated forms of coagulation factors V and VIII. Mutations in this gene have been associated with thrombophilia due to protein C deficiency, neonatal purpura fulminans, and recurrent venous thrombosis. A human PROC mRNA sequence is GenBank accession number NM_(—)000312.2, included herein as SEQ ID NO:1. A rhesus monkey (Macaca mulatta) PROC mRNA sequence is GenBank accession number XM_(—)001087196.2; a dog (Canis familiaris) PROC mRNA sequence is GenBank accession number NM_(—)001013849.1. A mouse (Mus muscularis) mRNA sequence is GenBank accession number NM_(—)001042767.1, included herein as SEQ ID NO:2.

As used herein, “target sequence” refers to a contiguous portion of the nucleotide sequence of an mRNA molecule formed during the transcription of a PROC gene, including mRNA that is a product of RNA processing of a primary transcription product.

As used herein, the term “strand comprising a sequence” refers to an oligonucleotide comprising a chain of nucleotides that is described by the sequence referred to using the standard nucleotide nomenclature.

As used herein, and unless otherwise indicated, the term “complementary,” when used to describe a first nucleotide sequence in relation to a second nucleotide sequence, refers to the ability of an oligonucleotide or polynucleotide comprising the first nucleotide sequence to hybridize and form a duplex structure under certain conditions with an oligonucleotide or polynucleotide comprising the second nucleotide sequence, as will be understood by the skilled person.

For example, a first nucleotide sequence can be described as complementary to a second nucleotide sequence when the two sequences hybridize (e.g., anneal) under stringent hybridization conditions. Hybridization conditions include temperature, ionic strength, pH, and organic solvent concentration for the annealing and/or washing steps. The term stringent hybridization conditions refers to conditions under which a first nucleotide sequence will hybridize preferentially to its target sequence, e.g., a second nucleotide sequence, and to a lesser extent to, or not at all to, other sequences. Stringent hybridization conditions are sequence dependent, and are different under different environmental parameters. Generally, stringent hybridization conditions are selected to be about 5° C. lower than the thermal melting point (T_(m)) for the nucleotide sequence at a defined ionic strength and pH. The T_(m) is the temperature (under defined ionic strength and pH) at which 50% of the first nucleotide sequences hybridize to a perfectly matched target sequence. An extensive guide to the hybridization of nucleic acids is found in, e.g., Tijssen (1993) Laboratory Techniques in Biochemistry and Molecular Biology—Hybridization with Nucleic Acid Probes part I, chap. 2, “Overview of principles of hybridization and the strategy of nucleic acid probe assays,” Elsevier, N.Y. (“Tijssen”).

Other conditions, such as physiologically relevant conditions as may be encountered inside an organism, can apply. The skilled person will be able to determine the set of conditions most appropriate for a test of complementarity of two sequences in accordance with the ultimate application of the hybridized nucleotides.

This includes base-pairing of the oligonucleotide or polynucleotide comprising the first nucleotide sequence to the oligonucleotide or polynucleotide comprising the second nucleotide sequence over the entire length of the first and second nucleotide sequence. Such sequences can be referred to as “fully complementary” with respect to each other herein. However, where a first sequence is referred to as “substantially complementary” with respect to a second sequence herein, the two sequences can be fully complementary, or they may form one or more, but generally not more than 4, 3 or 2 mismatched base pairs upon hybridization, while retaining the ability to hybridize under the conditions most relevant to their ultimate application. However, where two oligonucleotides are designed to form, upon hybridization, one or more single stranded overhangs, such overhangs shall not be regarded as mismatches with regard to the determination of complementarity. For example, a dsRNA comprising one oligonucleotide 21 nucleotides in length and another oligonucleotide 23 nucleotides in length, wherein the longer oligonucleotide comprises a sequence of 21 nucleotides that is fully complementary to the shorter oligonucleotide, may yet be referred to as “fully complementary” for the purposes described herein.

“Complementary” sequences, as used herein, may also include, or be formed entirely from, non-Watson-Crick base pairs and/or base pairs formed from non-natural and modified nucleotides, in as far as the above requirements with respect to their ability to hybridize are fulfilled. Such non-Watson-Crick base pairs includes, but not limited to, G:U Wobble or Hoogstein base pairing.

The terms “complementary,” “fully complementary” and “substantially complementary” herein may be used with respect to the base matching between the sense strand and the antisense strand of a dsRNA, or between the antisense strand of a dsRNA and a target sequence, as will be understood from the context of their use.

As used herein, a polynucleotide that is “substantially complementary to at least part of” a messenger RNA (mRNA) refers to a polynucleotide that is substantially complementary to a contiguous portion of the mRNA of interest (e.g., an mRNA encoding PROC) including a 5′ UTR, an open reading frame (ORF), or a 3′ UTR. For example, a polynucleotide is complementary to at least a part of a PROC mRNA if the sequence is substantially complementary to a non-interrupted portion of an mRNA encoding PROC.

In one embodiment, the antisense strand of the dsRNA is sufficiently complementary to a target mRNA so as to cause cleavage of the target mRNA.

The term “double-stranded RNA” or “dsRNA,” as used herein, refers to a complex of ribonucleic acid molecules, having a duplex structure comprising two anti-parallel and substantially complementary, as defined above, nucleic acid strands. In general, the majority of nucleotides of each strand are ribonucleotides, but as described in detail herein, each or both strands can also include at least one non-ribonucleotide, e.g., a deoxyribonucleotide and/or a modified nucleotide. In addition, as used in this specification, “dsRNA” may include chemical modifications to ribonucleotides, including substantial modifications at multiple nucleotides and including all types of modifications disclosed herein or known in the art. Any such modifications, as used in an siRNA type molecule, are encompassed by “dsRNA” for the purposes of this specification and claims.

The two strands forming the duplex structure may be different portions of one larger RNA molecule, or they may be separate RNA molecules. Where the two strands are part of one larger molecule, and therefore are connected by an uninterrupted chain of nucleotides between the 3′-end of one strand and the 5′-end of the respective other strand forming the duplex structure, the connecting RNA chain is referred to as a “hairpin loop.” Where the two strands are connected covalently by means other than an uninterrupted chain of nucleotides between the 3′-end of one strand and the 5′-end of the respective other strand forming the duplex structure, the connecting structure is referred to as a “linker” The RNA strands may have the same or a different number of nucleotides. The maximum number of base pairs is the number of nucleotides in the shortest strand of the dsRNA minus any overhangs that are present in the duplex. In addition to the duplex structure, a dsRNA may comprise one or more nucleotide overhangs. The term “siRNA” is also used herein to refer to a dsRNA as described above.

As used herein, a “nucleotide overhang” refers to the unpaired nucleotide or nucleotides that protrude from the duplex structure of a dsRNA when a 3′-end of one strand of the dsRNA extends beyond the 5′-end of the other strand, or vice versa. “Blunt” or “blunt end” means that there are no unpaired nucleotides at that end of the dsRNA, i.e., no nucleotide overhang. A “blunt ended” dsRNA is a dsRNA that is double-stranded over its entire length, i.e., no nucleotide overhang at either end of the molecule.

The term “antisense strand” refers to the strand of a dsRNA which includes a region that is substantially complementary to a target sequence. As used herein, the term “region of complementarity” refers to the region on the antisense strand that is substantially complementary to a sequence, for example a target sequence, as defined herein. Where the region of complementarity is not fully complementary to the target sequence, the mismatches are most tolerated in the terminal regions and, if present, are generally in a terminal region or regions, e.g., within 6, 5, 4, 3, or 2 nucleotides of the 5′ and/or 3′ terminus.

The term “sense strand,” as used herein, refers to the strand of a dsRNA that includes a region that is substantially complementary to a region of the antisense strand.

As used herein, the term “nucleic acid lipid particle” includes the term “SNALP” and refers to a vesicle of lipids coating a reduced aqueous interior comprising a nucleic acid such as a dsRNA or a plasmid from which a dsRNA is transcribed. Nucleic acid lipid particles, e.g., SNALP are described, e.g., in U.S. Patent Application Publication Nos. 20060240093, 20070135372, and U.S. Ser. No. 61/045,228 filed on Apr. 15, 2008. These applications are hereby incorporated by reference.

“Introducing into a cell,” when referring to a dsRNA, means facilitating uptake or absorption into the cell, as is understood by those skilled in the art. Absorption or uptake of dsRNA can occur through unaided diffusive or active cellular processes, or by auxiliary agents or devices. The meaning of this term is not limited to cells in vitro; a dsRNA may also be “introduced into a cell,” wherein the cell is part of a living organism. In such instance, introduction into the cell will include the delivery to the organism. For example, for in vivo delivery, dsRNA can be injected into a tissue site or administered systemically. In vitro introduction into a cell includes methods known in the art such as electroporation and lipofection. Further approaches are described herein or known in the art.

The terms “silence,” “inhibit the expression of,” “down-regulate the expression of,” “suppress the expression of” and the like in as far as they refer to a PROC gene, herein refer to the at least partial suppression of the expression of a PROC gene, as manifested by a reduction of the amount of mRNA which may be isolated from a first cell or group of cells in which a PROC gene is transcribed and which has or have been treated such that the expression of a PROC gene is inhibited, as compared to a second cell or group of cells substantially identical to the first cell or group of cells but which has or have not been so treated (control cells). The degree of inhibition is usually expressed in terms of

${\frac{\left( {{mRNA}\mspace{14mu}{in}\mspace{14mu}{control}\mspace{14mu}{cells}} \right) - \left( {{mRNA}\mspace{14mu}{in}\mspace{14mu}{treated}\mspace{14mu}{cells}} \right)}{\left( {{mRNA}\mspace{14mu}{in}\mspace{14mu}{control}\mspace{14mu}{cells}} \right)} \cdot 100}\%$

Alternatively, the degree of inhibition may be given in terms of a reduction of a parameter that is functionally linked to PROC gene expression, e.g., the amount of protein encoded by a PROC gene which is secreted by a cell, or the number of cells displaying a certain phenotype, e.g., apoptosis. In principle, PROC gene silencing may be determined in any cell expressing the target, either constitutively or by genomic engineering, and by any appropriate assay. However, when a reference is needed in order to determine whether a given dsRNA inhibits the expression of a PROC gene by a certain degree and therefore is encompassed by the instant invention, the assays provided in the Examples below shall serve as such reference.

For example, in certain instances, expression of a PROC gene is suppressed by at least about 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, or 50% by administration of the double-stranded oligonucleotide featured in the invention. In some embodiments, a PROC gene is suppressed by at least about 60%, 70%, or 80% by administration of the double-stranded oligonucleotide featured in the invention. In some embodiments, a PROC gene is suppressed by at least about 85%, 90%, or 95% by administration of the double-stranded oligonucleotide featured in the invention.

As used herein in the context of PROC expression, the terms “treat,” “treatment,” and the like, refer to relief from or alleviation of pathological processes mediated by PROC expression. In the context of the present invention insofar as it relates to any of the other conditions recited herein below (other than pathological processes mediated by PROC expression), the terms “treat,” “treatment,” and the like mean to relieve or alleviate at least one symptom associated with such condition, or to slow or reverse the progression of such condition.

As used herein, the phrases “effective amount” refers to an amount that provides a therapeutic benefit in the treatment, prevention, or management of pathological processes mediated by PROC expression or an overt symptom of pathological processes mediated by PROC expression. The specific amount that is effective can be readily determined by an ordinary medical practitioner, and may vary depending on factors known in the art, such as, for example, the type of pathological processes mediated by PROC expression, the patient's history and age, the stage of pathological processes mediated by PROC expression, and the administration of other anti-pathological processes mediated by PROC expression agents.

As used herein, a “pharmaceutical composition” comprises a pharmacologically effective amount of a dsRNA and a pharmaceutically acceptable carrier. As used herein, “pharmacologically effective amount,” “therapeutically effective amount” or simply “effective amount” refers to that amount of an RNA effective to produce the intended pharmacological, therapeutic or preventive result. For example, if a given clinical treatment is considered effective when there is at least a 25% reduction in a measurable parameter associated with a disease or disorder, a therapeutically effective amount of a drug for the treatment of that disease or disorder is the amount necessary to effect at least a 25% reduction in that parameter. For example, a therapeutically effective amount of a dsRNA targeting PROC can reduce PROC serum levels by at least 25%.

The term “pharmaceutically acceptable carrier” refers to a carrier for administration of a therapeutic agent. Such carriers include, but are not limited to, saline, buffered saline, dextrose, water, glycerol, ethanol, and combinations thereof. The term specifically excludes cell culture medium. For drugs administered orally, pharmaceutically acceptable carriers include, but are not limited to pharmaceutically acceptable excipients such as inert diluents, disintegrating agents, binding agents, lubricating agents, sweetening agents, flavoring agents, coloring agents and preservatives. Suitable inert diluents include sodium and calcium carbonate, sodium and calcium phosphate, and lactose, while corn starch and alginic acid are suitable disintegrating agents. Binding agents may include starch and gelatin, while the lubricating agent, if present, will generally be magnesium stearate, stearic acid or talc. If desired, the tablets may be coated with a material such as glyceryl monostearate or glyceryl distearate, to delay absorption in the gastrointestinal tract.

As used herein, a “transformed cell” is a cell into which a vector has been introduced from which a dsRNA molecule may be expressed.

II. Double-stranded ribonucleic acid (dsRNA)

As described in more detail herein, the invention provides double-stranded ribonucleic acid (dsRNA) molecules for inhibiting the expression of a PROC gene in a cell or mammal, where the dsRNA includes an antisense strand having a region of complementarity which is complementary to at least a part of an mRNA formed in the expression of a PROC gene, and where the region of complementarity is less than 30 nucleotides in length, generally 19-24 nucleotides in length, and where said dsRNA, upon contact with a cell expressing said PROC gene, inhibits the expression of said PROC gene by at least 30% as assayed by, for example, a PCR or branched DNA (bDNA)-based method, or by a protein-based method, such as by Western blot. Expression of a PROC gene can be reduced by at least 30% when measured by an assay as described in the Examples below. For example, expression of a PROC gene in cell culture, such as in Hep3B cells, can be assayed by measuring PROC mRNA levels, such as by bDNA or TaqMan assay, or by measuring protein levels, such as by ELISA assay. The dsRNA of the invention can further include one or more single-stranded nucleotide overhangs.

The dsRNA can be synthesized by standard methods known in the art as further discussed below, e.g., by use of an automated DNA synthesizer, such as are commercially available from, for example, Biosearch, Applied Biosystems, Inc. The dsRNA includes two RNA strands that are sufficiently complementary to hybridize to form a duplex structure. One strand of the dsRNA (the antisense strand) includes a region of complementarity that is substantially complementary, and generally fully complementary, to a target sequence, derived from the sequence of an mRNA formed during the expression of a PROC gene, the other strand (the sense strand) includes a region that is complementary to the antisense strand, such that the two strands hybridize and form a duplex structure when combined under suitable conditions. Generally, the duplex structure is between 15 and 30 or between 25 and 30, or between 18 and 25, or between 19 and 24, or between 19 and 21, or 19, 20, or 21 base pairs in length. In one embodiment the duplex is 19 base pairs in length. In another embodiment the duplex is 21 base pairs in length. When two different siRNAs are used in combination, the duplex lengths can be identical or can differ.

Each strand of the dsRNA of invention is generally between 15 and 30, or between 18 and 25, or 18, 19, 20, 21, 22, 23, 24, or 25 nucleotides in length. In other embodiments, each is strand is 25-30 nucleotides in length. Each strand of the duplex can be the same length or of different lengths. When two different siRNAs are used in combination, the lengths of each strand of each siRNA can be identical or can differ.

The dsRNA of the invention include dsRNA that are longer than 21-23 nucleotides, e.g., dsRNA that are long enough to be processed by the RNase III enzyme Dicer into 21-23 basepair siRNA which are then incorporated into a RISC. Accordingly, a dsRNA of the invention can be at least 25, 26, 27, 28, 29, 30, 40, 50, 60, 70, 80, 90, or at least 100 basepairs in length.

The dsRNA of the invention can include one or more single-stranded overhang(s) of one or more nucleotides. In one embodiment, at least one end of the dsRNA has a single-stranded nucleotide overhang of 1 to 4, generally 1 or 2 nucleotides. In another embodiment, the antisense strand of the dsRNA has 1-10 nucleotides overhangs each at the 3′ end and the 5′ end over the sense strand. In further embodiments, the sense strand of the dsRNA has 1-10 nucleotides overhangs each at the 3′ end and the 5′ end over the antisense strand.

A dsRNAs having at least one nucleotide overhang can have unexpectedly superior inhibitory properties than the blunt-ended counterpart. In some embodiments the presence of only one nucleotide overhang strengthens the interference activity of the dsRNA, without affecting its overall stability. A dsRNA having only one overhang has proven particularly stable and effective in vivo, as well as in a variety of cells, cell culture mediums, blood, and serum. Generally, the single-stranded overhang is located at the 3′-terminal end of the antisense strand or, alternatively, at the 3′-terminal end of the sense strand. The dsRNA can also have a blunt end, generally located at the 5′-end of the antisense strand. Such dsRNAs can have improved stability and inhibitory activity, thus allowing administration at low dosages, i.e., less than 5 mg/kg body weight of the recipient per day. Generally, the antisense strand of the dsRNA has a nucleotide overhang at the 3′-end, and the 5′-end is blunt. In another embodiment, one or more of the nucleotides in the overhang is replaced with a nucleoside thiophosphate.

In one embodiment, a PROC gene is a human PROC gene. In specific embodiments, the sense strand of the dsRNA is one of the sense sequences from Table 1, Table 2, Table 5, Table 8, or Table 9, and the antisense strand is one of the antisense sequences of Table 1, Table 2, Table 5, Table 8, or Table 9. Alternative antisense agents that target elsewhere in the target sequence provided in Table 1, Table 2, Table 5, Table 8, or Table 9 can readily be determined using the target sequence and the flanking PROC sequence.

The skilled person is well aware that dsRNAs having a duplex structure of between 20 and 23, but specifically 21, base pairs have been hailed as particularly effective in inducing RNA interference (Elbashir et al., EMBO 2001, 20:6877-6888). However, others have found that shorter or longer dsRNAs can be effective as well. In the embodiments described above, by virtue of the nature of the oligonucleotide sequences provided in Table 1, Table 2, Table 5, Table 8, or Table 9, the dsRNAs featured in the invention can include at least one strand of a length described herein. It can be reasonably expected that shorter dsRNAs having one of the sequences of Table 1, Table 2, Table 5, Table 8, or Table 9. minus only a few nucleotides on one or both ends may be similarly effective as compared to the dsRNAs described above. Hence, dsRNAs having a partial sequence of at least 15, 16, 17, 18, 19, 20, or more contiguous nucleotides from one of the sequences of Table 1, Table 2, Table 5, Table 8, or Table 9., and differing in their ability to inhibit the expression of a PROC gene in an assay as described herein below by not more than 5, 10, 15, 20, 25, or 30% inhibition from a dsRNA comprising the full sequence, are contemplated by the invention. Further, dsRNAs that cleave within a desired PROC target sequence can readily be made using the corresponding PROC antisense sequence and a complementary sense sequence.

In addition, the dsRNAs provided in Table 1, Table 2, Table 5, Table 8, or Table 9. identify a site in a PROC that is susceptible to RNAi based cleavage. As such, the present invention further features dsRNAs that target within the sequence targeted by one of the agents of the present invention. As used herein, a second dsRNA is said to target within the sequence of a first dsRNA if the second dsRNA cleaves the message anywhere within the mRNA that is complementary to the antisense strand of the first dsRNA. Such a second dsRNA will generally consist of at least 15 contiguous nucleotides from one of the sequences provided in Table 1, Table 2, Table 5, Table 8, or Table 9 coupled to additional nucleotide sequences taken from the region contiguous to the selected sequence in a PROC gene.

Cleavage of the RNA target can be routinely detected by gel electrophoresis and, if necessary, associated nucleic acid hybridization techniques known in the art. The cleavage site on the target mRNA of a dsRNA can be determined using methods generally known to one of ordinary skill in the art, e.g., the 5′-RACE method described in Soutschek et al., Nature; 2004, Vol. 432, pp. 173-178 (which is herein incorporated by reference for all purposes).

The dsRNA featured in the invention can contain one or more mismatches to the target sequence. In one embodiment, the dsRNA featured in the invention contains no more than 3 mismatches. If the antisense strand of the dsRNA contains mismatches to a target sequence, it is preferable that the area of mismatch not be located in the center of the region of complementarity. If the antisense strand of the dsRNA contains mismatches to the target sequence, it is preferable that the mismatch be restricted to 5 nucleotides from either end, for example 5, 4, 3, 2, or 1 nucleotide from either the 5′ or 3′ end of the region of complementarity. For example, for a 23 nucleotide dsRNA strand which is complementary to a region of a PROC gene, the dsRNA generally does not contain any mismatch within the central 13 nucleotides. The methods described within the invention can be used to determine whether a dsRNA containing a mismatch to a target sequence is effective in inhibiting the expression of a PROC gene. Consideration of the efficacy of dsRNAs with mismatches in inhibiting expression of a PROC gene is important, especially if the particular region of complementarity in a PROC gene is known to have polymorphic sequence variation within the population.

In another aspect, the invention is a single-stranded antisense oligonucleotide RNAi. An antisense oligonucleotide is a single-stranded oligonucleotide that is complementary to a sequence within the target mRNA. Antisense oligonucleotides can inhibit translation in a stoichiometric manner by base pairing to the mRNA and physically obstructing the translation machinery, see Dias, N. et al., (2002) Mol. Cancer Ther. 1:347-355. Antisense oligonucleotides can also inhibit target protein expression by binding to the mRNA target and promoting mRNA target destruction via RNase-H. The single-stranded antisense RNA molecule can be about 13 to about 30 nucleotides in length and have a sequence that is complementary to a target sequence. For example, the single-stranded antisense RNA molecule can comprise a sequence that is at least about 13, 14, 15, 16, 17, 18, 19, 20, or more contiguous nucleotides from one of the antisense sequences in the tables.

Modifications

In yet another embodiment, the dsRNA is chemically modified to enhance stability. The nucleic acids featured in the invention may be synthesized and/or modified by methods well established in the art, such as those described in “Current protocols in nucleic acid chemistry,” Beaucage, S. L. et al. (Eds.), John Wiley & Sons, Inc., New York, N.Y., USA, which is hereby incorporated herein by reference. Specific examples of dsRNA compounds useful in this invention include dsRNAs containing modified backbones or no natural internucleoside linkages. As defined in this specification, dsRNAs having modified backbones include those that retain a phosphorus atom in the backbone and those that do not have a phosphorus atom in the backbone. For the purposes of this specification, and as sometimes referenced in the art, modified dsRNAs that do not have a phosphorus atom in their internucleoside backbone can also be considered to be oligonucleosides.

Modified dsRNA backbones include, for example, phosphorothioates, chiral phosphorothioates, phosphorodithioates, phosphotriesters, aminoalkylphosphotriesters, methyl and other alkyl phosphonates including 3′-alkylene phosphonates and chiral phosphonates, phosphinates, phosphoramidates including 3′-amino phosphoramidate and aminoalkylphosphoramidates, thionophosphoramidates, thionoalkylphosphonates, thionoalkylphosphotriesters, and boranophosphates having normal 3′-5′ linkages, 2′-5′ linked analogs of these, and those) having inverted polarity wherein the adjacent pairs of nucleoside units are linked 3′-5′ to 5′-3′ or 2′-5′ to 5′-2′. Various salts, mixed salts and free acid forms are also included.

Representative U.S. patents that teach the preparation of the above phosphorus-containing linkages include, but are not limited to, U.S. Pat. Nos. 3,687,808; 4,469,863; 4,476,301; 5,023,243; 5,177,195; 5,188,897; 5,264,423; 5,276,019; 5,278,302; 5,286,717; 5,321,131; 5,399,676; 5,405,939; 5,453,496; 5,455,233; 5,466,677; 5,476,925; 5,519,126; 5,536,821; 5,541,316; 5,550,111; 5,563,253; 5,571,799; 5,587,361; and 5,625,050, each of which is herein incorporated by reference

Modified dsRNA backbones that do not include a phosphorus atom therein have backbones that are formed by short chain alkyl or cycloalkyl internucleoside linkages, mixed heteroatoms and alkyl or cycloalkyl internucleoside linkages, or ore or more short chain heteroatomic or heterocyclic internucleoside linkages. These include those having morpholino linkages (formed in part from the sugar portion of a nucleoside); siloxane backbones; sulfide, sulfoxide and sulfone backbones; formacetyl and thioformacetyl backbones; methylene formacetyl and thioformacetyl backbones; alkene containing backbones; sulfamate backbones; methyleneimino and methylenehydrazino backbones; sulfonate and sulfonamide backbones; amide backbones; and others having mixed N, O, S and CH₂ component parts.

Representative U.S. patents that teach the preparation of the above oligonucleosides include, but are not limited to, U.S. Pat. Nos. 5,034,506; 5,166,315; 5,185,444; 5,214,134; 5,216,141; 5,235,033; 5,64,562; 5,264,564; 5,405,938; 5,434,257; 5,466,677; 5,470,967; 5,489,677; 5,541,307; 5,561,225; 5,596,086; 5,602,240; 5,608,046; 5,610,289; 5,618,704; 5,623,070; 5,663,312; 5,633,360; 5,677,437; and, 5,677,439, each of which is herein incorporated by reference.

In other suitable dsRNA mimetics, both the sugar and the internucleoside linkage, i.e., the backbone, of the nucleotide units are replaced with novel groups. The base units are maintained for hybridization with an appropriate nucleic acid target compound. One such oligomeric compound, a dsRNA mimetic that has been shown to have excellent hybridization properties, is referred to as a peptide nucleic acid (PNA). In PNA compounds, the sugar backbone of a dsRNA is replaced with an amide containing backbone, in particular an aminoethylglycine backbone. The nucleobases are retained and are bound directly or indirectly to aza nitrogen atoms of the amide portion of the backbone. Representative U.S. patents that teach the preparation of PNA compounds include, but are not limited to, U.S. Pat. Nos. 5,539,082; 5,714,331; and 5,719,262, each of which is herein incorporated by reference. Further teaching of PNA compounds can be found in Nielsen et al., Science, 1991, 254, 1497-1500.

Other embodiments of the invention are dsRNAs with phosphorothioate backbones and oligonucleosides with heteroatom backbones, and in particular —CH₂—NH—CH₂—, —CH₂—N(CH₃)—O—CH₂— [known as a methylene (methylimino) or MMI backbone], —CH₂—O—N(CH₃)—CH₂—, —CH₂—N(CH₃)—N(CH₃)—CH₂— and —N(CH₃)—CH₂—CH₂— [wherein the native phosphodiester backbone is represented as —O—P—O—CH₂—] of the above-referenced U.S. Pat. No. 5,489,677, and the amide backbones of the above-referenced U.S. Pat. No. 5,602,240. Also preferred are dsRNAs having morpholino backbone structures of the above-referenced U.S. Pat. No. 5,034,506.

Modified dsRNAs may also contain one or more substituted sugar moieties. Preferred dsRNAs comprise one of the following at the 2′ position: OH; F; O—, S—, or N-alkyl; O—, S—, or N-alkenyl; O—, S—or N-alkynyl; or O-alkyl-O-alkyl, wherein the alkyl, alkenyl and alkynyl may be substituted or unsubstituted C₁ to C₁₀ alkyl or C₂ to C₁₀ alkenyl and alkynyl. Particularly preferred are O[(CH₂)_(n)O]_(m)CH₃, O(CH₂)_(n)OCH₃, O(CH₂)_(n)NH₂, O(CH₂)_(n)CH₃, O(CH₂)_(n)ONH₂, and O(CH₂)_(n)ON[(CH₂)_(n)CH₃)]₂, where n and m are from 1 to about 10. Other preferred dsRNAs comprise one of the following at the 2′ position: C₁ to C₁₀ lower alkyl, substituted lower alkyl, alkaryl, aralkyl, O-alkaryl or O-aralkyl, SH, SCH₃, OCN, Cl, Br, CN, CF₃, OCF₃, SOCH₃, SO₂CH₃, ONO₂, NO₂, N₃, NH₂, heterocycloalkyl, heterocycloalkaryl, aminoalkylamino, polyalkylamino, substituted silyl, an RNA cleaving group, a reporter group, an intercalator, a group for improving the pharmacokinetic properties of an dsRNA, or a group for improving the pharmacodynamic properties of an dsRNA, and other substituents having similar properties. A preferred modification includes 2′-methoxyethoxy (2′-O—CH₂CH₂OCH₃, also known as 2′-O-(2-methoxyethyl) or 2′-MOE) (Martin et al., Helv. Chim. Acta, 1995, 78, 486-504) i.e., an alkoxyalkoxy group. A further preferred modification includes 2′-dimethylaminooxyethoxy, i.e., a O(CH₂)₂ON(CH₃)₂ group, also known as 2′-DMAOE, as described in examples herein below, and 2′-dimethylaminoethoxyethoxy (also known in the art as 2′-O-dimethylaminoethoxyethyl or 2′-DMAEOE), i.e., 2′-O—CH₂—O—CH₂—N(CH₂)₂, also described in examples herein below.

Other preferred modifications include 2′-methoxy (2′-OCH₃), 2′-aminopropoxy (2′-OCH₂CH₂CH₂NH₂) and 2′-fluoro (2′-F). Similar modifications may also be made at other positions on the dsRNA, particularly the 3′ position of the sugar on the 3′ terminal nucleotide or in 2′-5′ linked dsRNAs and the 5′ position of 5′ terminal nucleotide. DsRNAs may also have sugar mimetics such as cyclobutyl moieties in place of the pentofuranosyl sugar. Representative U.S. patents that teach the preparation of such modified sugar structures include, but are not limited to, U.S. Pat. Nos. 4,981,957; 5,118,800; 5,319,080; 5,359,044; 5,393,878; 5,446,137; 5,466,786; 5,514,785; 5,519,134; 5,567,811; 5,576,427; 5,591,722; 5,597,909; 5,610,300; 5,627,053; 5,639,873; 5,646,265; 5,658,873; 5,670,633; and 5,700,920, certain of which are commonly owned with the instant application, and each of which is herein incorporated by reference in its entirety.

dsRNAs may also include nucleobase (often referred to in the art simply as “base”) modifications or substitutions. As used herein, “unmodified” or “natural” nucleobases include the purine bases adenine (A) and guanine (G), and the pyrimidine bases thymine (T), cytosine (C) and uracil (U). Modified nucleobases include other synthetic and natural nucleobases such as 5-methylcytosine (5-me-C), 5-hydroxymethyl cytosine, xanthine, hypoxanthine, 2-aminoadenine, 6-methyl and other alkyl derivatives of adenine and guanine, 2-propyl and other alkyl derivatives of adenine and guanine, 2-thiouracil, 2-thiothymine and 2-thiocytosine, 5-halouracil and cytosine, 5-propynyl uracil and cytosine, 6-azo uracil, cytosine and thymine, 5-uracil (pseudouracil), 4-thiouracil, 8-halo, 8-amino, 8-thiol, 8-thioalkyl, 8-hydroxyl anal other 8-substituted adenines and guanines, 5-halo, particularly 5-bromo, 5-trifluoromethyl and other 5-substituted uracils and cytosines, 7-methylguanine and 7-methyladenine, 8-azaguanine and 8-azaadenine, 7-deazaguanine and 7-daazaadenine and 3-deazaguanine and 3-deazaadenine. Further nucleobases include those disclosed in U.S. Pat. No. 3,687,808, those disclosed in The Concise Encyclopedia Of Polymer Science And Engineering, pages 858-859, Kroschwitz, J. L, ed. John Wiley & Sons, 1990, these disclosed by Englisch et al., Angewandte Chemie, International Edition, 1991, 30, 613, and those disclosed by Sanghvi, Y. S., Chapter 15, DsRNA Research and Applications, pages 289-302, Crooke, S. T. and Lebleu, B., Ed., CRC Press, 1993. Certain of these nucleobases are particularly useful for increasing the binding affinity of the oligomeric compounds featured in the invention. These include 5-substituted pyrimidines, 6-azapyrimidines and N-2, N-6 and 0-6 substituted purines, including 2-aminopropyladenine, 5-propynyluracil and 5-propynylcytosine. 5-methylcytosine substitutions have been shown to increase nucleic acid duplex stability by 0.6-1.2° C. (Sanghvi, Y. S., Crooke, S. T. and Lebleu, B., Eds., DsRNA Research and Applications, CRC Press, Boca Raton, 1993, pp. 276-278) and are exemplary base substitutions, even more particularly when combined with 2′-O-methoxyethyl sugar modifications.

Representative U.S. patents that teach the preparation of certain of the above noted modified nucleobases as well as other modified nucleobases include, but are not limited to, the above noted U.S. Pat. No. 3,687,808, as well as U.S. Pat. Nos. 4,845,205; 5,130,30; 5,134,066; 5,175,273; 5,367,066; 5,432,272; 5,457,187; 5,459,255; 5,484,908; 5,502,177; 5,525,711; 5,552,540; 5,587,469; 5,594,121, 5,596,091; 5,614,617; and 5,681,941, each of which is herein incorporated by reference, and U.S. Pat. No. 5,750,692, also herein incorporated by reference.

Conjugates

Another modification of the dsRNAs of the invention involves chemically linking to the dsRNA one or more moieties or conjugates which enhance the activity, cellular distribution or cellular uptake of the dsRNA. Such moieties include but are not limited to lipid moieties such as a cholesterol moiety (Letsinger et al., Proc. Natl. Acid. Sci. USA, 1989, 86: 6553-6556), cholic acid (Manoharan et al., Biorg. Med. Chem. Let., 1994, 4:1053-1060), a thioether, e.g., beryl-5-tritylthiol (Manoharan et al., Ann. N.Y. Acad. Sci., 1992, 660:306-309; Manoharan et al., Biorg. Med. Chem. Let., 1993, 3:2765-2770), a thiocholesterol (Oberhauser et al., Nucl. Acids Res., 1992, 20:533-538), an aliphatic chain, e.g., dodecandiol or undecyl residues (Saison-Behmoaras et al., EMBO J, 1991, 10:1111-1118; Kabanov et al., FEBS Lett., 1990, 259:327-330; Svinarchuk et al., Biochimie, 1993, 75:49-54), a phospholipid, e.g., di-hexadecyl-racglycerol or triethyl-ammonium 1,2-di-O-hexadecyl-rac-glycero-3-Hphosphonate (Manoharan et al., Tetrahedron Lett., 1995, 36:3651-3654; Shea et al., Nucl. Acids Res., 1990, 18:3777-3783), a polyamine or a polyethylene glycol chain (Manoharan et al., Nucleosides & Nucleotides, 1995, 14:969-973), or adamantane acetic acid (Manoharan et al., Tetrahedron Lett., 1995, 36:3651-3654), a palmityl moiety (Mishra et al., Biochim. Biophys. Acta, 1995, 1264:229-237), or an octadecylamine or hexylamino-carbonyloxycholesterol moiety (Crooke et al., J. Pharmacol. Exp. Ther., 1996, 277:923-937).

It is not necessary for all positions in a given compound to be uniformly modified, and in fact more than one of the aforementioned modifications may be incorporated in a single compound or even at a single nucleoside within a dsRNA. The present invention also includes dsRNA compounds which are chimeric compounds. “Chimeric” dsRNA compounds or “chimeras,” in the context of this invention, are dsRNA compounds, particularly dsRNAs, which contain two or more chemically distinct regions, each made up of at least one monomer unit, i.e., a nucleotide in the case of a dsRNA compound. These dsRNAs typically contain at least one region wherein the dsRNA is modified so as to confer upon the dsRNA increased resistance to nuclease degradation, increased cellular uptake, and/or increased binding affinity for the target nucleic acid. An additional region of the dsRNA may serve as a substrate for enzymes capable of cleaving RNA:DNA or RNA:RNA hybrids. By way of example, RNase H is a cellular endonuclease which cleaves the RNA strand of an RNA:DNA duplex. Activation of RNase H, therefore, results in cleavage of the RNA target, thereby greatly enhancing the efficiency of dsRNA inhibition of gene expression. Consequently, comparable results can often be obtained with shorter dsRNAs when chimeric dsRNAs are used, compared to phosphorothioate deoxy dsRNAs hybridizing to the same target region.

In certain instances, the dsRNA may be modified by a non-ligand group. A number of non-ligand molecules have been conjugated to dsRNAs in order to enhance the activity, cellular distribution or cellular uptake of the dsRNA, and procedures for performing such conjugations are available in the scientific literature. Such non-ligand moieties have included lipid moieties, such as cholesterol (Letsinger et al., Proc. Natl. Acad. Sci. USA, 1989, 86:6553), cholic acid (Manoharan et al., Bioorg. Med. Chem. Lett., 1994, 4:1053), a thioether, e.g., hexyl-S-tritylthiol (Manoharan et al., Ann. N.Y. Acad. Sci., 1992, 660:306; Manoharan et al., Bioorg. Med. Chem. Let., 1993, 3:2765), a thiocholesterol (Oberhauser et al., Nucl. Acids Res., 1992, 20:533), an aliphatic chain, e.g., dodecandiol or undecyl residues (Saison-Behmoaras et al., EMBO J., 1991, 10:111; Kabanov et al., FEBS Lett., 1990, 259:327; Svinarchuk et al., Biochimie, 1993, 75:49), a phospholipid, e.g., di-hexadecyl-rac-glycerol or triethylammonium 1,2-di-O-hexadecyl-rac-glycero-3-H-phosphonate (Manoharan et al., Tetrahedron Lett., 1995, 36:3651; Shea et al., Nucl. Acids Res., 1990, 18:3777), a polyamine or a polyethylene glycol chain (Manoharan et al., Nucleosides & Nucleotides, 1995, 14:969), or adamantane acetic acid (Manoharan et al., Tetrahedron Lett., 1995, 36:3651), a palmityl moiety (Mishra et al., Biochim. Biophys. Acta, 1995, 1264:229), or an octadecylamine or hexylamino-carbonyl-oxycholesterol moiety (Crooke et al., J. Pharmacol. Exp. Ther., 1996, 277:923). Representative United States patents that teach the preparation of such dsRNA conjugates have been listed above. Typical conjugation protocols involve the synthesis of dsRNAs bearing an aminolinker at one or more positions of the sequence. The amino group is then reacted with the molecule being conjugated using appropriate coupling or activating reagents. The conjugation reaction may be performed either with the dsRNA still bound to the solid support or following cleavage of the dsRNA in solution phase. Purification of the dsRNA conjugate by HPLC typically affords the pure conjugate.

Conjugating a ligand to a dsRNA can enhance its cellular absorption as well as targeting to a particular tissue or uptake by specific types of cells such as liver cells. In certain instances, a hydrophobic ligand is conjugated to the dsRNA to facilitate direct permeation of the cellular membrane and or uptake across the liver cells. Alternatively, the ligand conjugated to the dsRNA is a substrate for receptor-mediated endocytosis. These approaches have been used to facilitate cell permeation of antisense oligonucleotides as well as dsRNA agents. For example, cholesterol has been conjugated to various antisense oligonucleotides resulting in compounds that are substantially more active compared to their non-conjugated analogs. See M. Manoharan Antisense & Nucleic Acid Drug Development 2002, 12, 103. Other lipophilic compounds that have been conjugated to oligonucleotides include 1-pyrene butyric acid, 1,3-bis-O-(hexadecyl)glycerol, and menthol. One example of a ligand for receptor-mediated endocytosis is folic acid. Folic acid enters the cell by folate-receptor-mediated endocytosis. dsRNA compounds bearing folic acid would be efficiently transported into the cell via the folate-receptor-mediated endocytosis. Li and coworkers report that attachment of folic acid to the 3′-terminus of an oligonucleotide resulted in an 8-fold increase in cellular uptake of the oligonucleotide. Li, S.; Deshmukh, H. M.; Huang, L. Pharm. Res. 1998, 15, 1540. Other ligands that have been conjugated to oligonucleotides include polyethylene glycols, carbohydrate clusters, cross-linking agents, porphyrin conjugates, delivery peptides and lipids such as cholesterol and cholesterylamine. Examples of carbohydrate clusters include Chol-p-(GalNAc)₃ (N-acetyl galactosamine cholesterol) and LCO(GalNAc)₃ (N-acetyl galactosamine-3′-Lithocholic-oleoyl.

Carbohydrate Conjugates

In some embodiments of the compositions and methods of the invention, a dsRNA oligonucleotide further comprises a carbohydrate. The carbohydrate conjugated dsRNA are advantageous for the in vivo delivery of nucleic acids, as well as compositions suitable for in vivo therapeutic use, as described herein. As used herein, “carbohydrate” refers to a compound which is either a carbohydrate per se made up of one or more monosaccharide units having at least 6 carbon atoms (which can be linear, branched or cyclic) with an oxygen, nitrogen or sulfur atom bonded to each carbon atom; or a compound having as a part thereof a carbohydrate moiety made up of one or more monosaccharide units each having at least six carbon atoms (which can be linear, branched or cyclic), with an oxygen, nitrogen or sulfur atom bonded to each carbon atom. Representative carbohydrates include the sugars (mono-, di-, tri- and oligosaccharides containing from about 4, 5, 6, 7, 8, or 9 monosaccharide units), and polysaccharides such as starches, glycogen, cellulose and polysaccharide gums. Specific monosaccharides include C5 and above (e.g., C5, C6, C7, or C8) sugars; di- and trisaccharides include sugars having two or three monosaccharide units (e.g., C5, C6, C7, or C8).

In one embodiment, a carbohydrate conjugate for use in the compositions and methods of the invention is a monosaccharide. In one embodiment, the monosaccharide is an N-acetylgalactosamine, such as

In another embodiment, a carbohydrate conjugate for use in the compositions and methods of the invention is selected from the group consisting of:

Another representative carbohydrate conjugate for use in the embodiments described herein includes, but is not limited to,

when one of X or Y is an oligonucleotide, the other is a hydrogen.

In some embodiments, the carbohydrate conjugate further comprises one or more additional ligands as described above, such as, but not limited to, a PK modulator and/or a cell permeation peptide.

Linkers

In some embodiments, the conjugate or ligand described herein can be attached to a dsRNA of the invention with various linkers that can be cleavable or non cleavable.

The term “linker” or “linking group” means an organic moiety that connects two parts of a compound, e.g., covalently attaches two parts of a compound. Linkers typically comprise a direct bond or an atom such as oxygen or sulfur, a unit such as NR8, C(O), C(O)NH, SO, SO₂, SO₂NH or a chain of atoms, such as, but not limited to, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, arylalkyl, arylalkenyl, arylalkynyl, heteroarylalkyl, heteroarylalkenyl, heteroarylalkynyl, heterocyclylalkyl, heterocyclylalkenyl, heterocyclylalkynyl, aryl, heteroaryl, heterocyclyl, cycloalkyl, cycloalkenyl, alkylarylalkyl, alkylarylalkenyl, alkylarylalkynyl, alkenylarylalkyl, alkenylarylalkenyl, alkenylarylalkynyl, alkynylarylalkyl, alkynylarylalkenyl, alkynylarylalkynyl, alkylheteroarylalkyl, alkylheteroarylalkenyl, alkylheteroarylalkynyl, alkenylheteroarylalkyl, alkenylheteroarylalkenyl, alkenylheteroarylalkynyl, alkynylheteroarylalkyl, alkynylheteroarylalkenyl, alkynylheteroarylalkynyl, alkylheterocyclylalkyl, alkylheterocyclylalkenyl, alkylhererocyclylalkynyl, alkenylheterocyclylalkyl, alkenylheterocyclylalkenyl, alkenylheterocyclylalkynyl, alkynylheterocyclylalkyl, alkynylheterocyclylalkenyl, alkynylheterocyclylalkynyl, alkylaryl, alkenylaryl, alkynylaryl, alkylheteroaryl, alkenylheteroaryl, alkynylhereroaryl, which one or more methylenes can be interrupted or terminated by O, S, S(O), SO₂, N(R8), C(O), substituted or unsubstituted aryl, substituted or un-substituted heteroaryl, substituted or unsubstituted heterocyclic; where R8 is hydrogen, acyl, aliphatic or substituted aliphatic. In one embodiment, the linker is between about 1-24 atoms, 2-24, 3-24, 4-24, 5-24, 6-24, 6-18, 7-18, 8-18 atoms, 7-17, 8-17, 6-16, 7-17, or 8-16 atoms.

A cleavable linking group is one which is sufficiently stable outside the cell, but which upon entry into a target cell is cleaved to release the two parts the linker is holding together. In a preferred embodiment, the cleavable linking group is cleaved at least about 10 times, 20, times, 30 times, 40 times, 50 times, 60 times, 70 times, 80 times, 90 times or more, or at least about 100 times faster in a target cell or under a first reference condition (which can, e.g., be selected to mimic or represent intracellular conditions) than in the blood of a subject, or under a second reference condition (which can, e.g., be selected to mimic or represent conditions found in the blood or serum).

Cleavable linking groups are susceptible to cleavage agents, e.g., pH, redox potential or the presence of degradative molecules. Generally, cleavage agents are more prevalent or found at higher levels or activities inside cells than in serum or blood. Examples of such degradative agents include: redox agents which are selected for particular substrates or which have no substrate specificity, including, e.g., oxidative or reductive enzymes or reductive agents such as mercaptans, present in cells, that can degrade a redox cleavable linking group by reduction; esterases; endosomes or agents that can create an acidic environment, e.g., those that result in a pH of five or lower; enzymes that can hydrolyze or degrade an acid cleavable linking group by acting as a general acid, peptidases (which can be substrate specific), and phosphatases.

A cleavable linkage group, such as a disulfide bond can be susceptible to pH. The pH of human serum is 7.4, while the average intracellular pH is slightly lower, ranging from about 7.1-7.3. Endosomes have a more acidic pH, in the range of 5.5-6.0, and lysosomes have an even more acidic pH at around 5.0. Some linkers will have a cleavable linking group that is cleaved at a preferred pH, thereby releasing a cationic lipid from the ligand inside the cell, or into the desired compartment of the cell.

A linker can include a cleavable linking group that is cleavable by a particular enzyme. The type of cleavable linking group incorporated into a linker can depend on the cell to be targeted. For example, a liver-targeting ligand can be linked to a cationic lipid through a linker that includes an ester group. Liver cells are rich in esterases, and therefore the linker will be cleaved more efficiently in liver cells than in cell types that are not esterase-rich. Other cell-types rich in esterases include cells of the lung, renal cortex, and testis.

Linkers that contain peptide bonds can be used when targeting cell types rich in peptidases, such as liver cells and synoviocytes.

In general, the suitability of a candidate cleavable linking group can be evaluated by testing the ability of a degradative agent (or condition) to cleave the candidate linking group. It will also be desirable to also test the candidate cleavable linking group for the ability to resist cleavage in the blood or when in contact with other non-target tissue. Thus, one can determine the relative susceptibility to cleavage between a first and a second condition, where the first is selected to be indicative of cleavage in a target cell and the second is selected to be indicative of cleavage in other tissues or biological fluids, e.g., blood or serum. The evaluations can be carried out in cell free systems, in cells, in cell culture, in organ or tissue culture, or in whole animals. It can be useful to make initial evaluations in cell-free or culture conditions and to confirm by further evaluations in whole animals. In preferred embodiments, useful candidate compounds are cleaved at least about 2, 4, 10, 20, 30, 40, 50, 60, 70, 80, 90, or about 100 times faster in the cell (or under in vitro conditions selected to mimic intracellular conditions) as compared to blood or serum (or under in vitro conditions selected to mimic extracellular conditions).

In one embodiment, a cleavable linking group is a redox cleavable linking group that is cleaved upon reduction or oxidation. An example of reductively cleavable linking group is a disulphide linking group (—S—S—). To determine if a candidate cleavable linking group is a suitable “reductively cleavable linking group,” or for example is suitable for use with a particular dsRNA moiety and particular targeting agent one can look to methods described herein. For example, a candidate can be evaluated by incubation with dithiothreitol (DTT), or other reducing agent using reagents know in the art, which mimic the rate of cleavage which would be observed in a cell, e.g., a target cell. The candidates can also be evaluated under conditions which are selected to mimic blood or serum conditions. In one, candidate compounds are cleaved by at most about 10% in the blood. In other embodiments, useful candidate compounds are degraded at least about 2, 4, 10, 20, 30, 40, 50, 60, 70, 80, 90, or about 100 times faster in the cell (or under in vitro conditions selected to mimic intracellular conditions) as compared to blood (or under in vitro conditions selected to mimic extracellular conditions). The rate of cleavage of candidate compounds can be determined using standard enzyme kinetics assays under conditions chosen to mimic intracellular media and compared to conditions chosen to mimic extracellular media.

In another embodiment, a cleavable linker comprises a phosphate-based cleavable linking group. A phosphate-based cleavable linking group is cleaved by agents that degrade or hydrolyze the phosphate group. An example of an agent that cleaves phosphate groups in cells are enzymes such as phosphatases in cells. Examples of phosphate-based linking groups are —O—P(O)(ORk)-O—, —O—P(S)(ORk)-O—, —O—P(S)(SRk)-O—, —S—P(O)(ORk)-O—, —O—P(O)(ORk)-S—, —S—P(O)(ORk)-S—, —O—P(S)(ORk)-S—, —S—P(S)(ORk)-O—, —O—P(O)(Rk)-O—, —O—P(S)(Rk)-O—, —S—P(O)(Rk)-O—, —S—P(S)(Rk)-O—, —S—P(O)(Rk)-S—, —O—P(S)(Rk)-S—. Preferred embodiments are —O—P(O)(OH)—O—, —O—P(S)(OH)—O—, —O—P(S)(SH)—O—, —S—P(O)(OH)—O—, —O—P(O)(OH)—S—, —S—P(O)(OH)—S—, —O—P(S)(OH)—S—, —S—P(S)(OH)—O—, —O—P(O)(H)—O—, —O—P(S)(H)—O—, —S—P(O)(H)—O—, —S—P(S)(H)—O—, —S—P(O)(H)—S—, —O—P(S)(H)—S—. A preferred embodiment is —O—P(O)(OH)—O—. These candidates can be evaluated using methods analogous to those described above.

In another embodiment, a cleavable linker comprises an acid cleavable linking group. An acid cleavable linking group is a linking group that is cleaved under acidic conditions. In preferred embodiments acid cleavable linking groups are cleaved in an acidic environment with a pH of about 6.5 or lower (e.g., about 6.0, 5.75, 5.5, 5.25, 5.0, or lower), or by agents such as enzymes that can act as a general acid. In a cell, specific low pH organelles, such as endosomes and lysosomes can provide a cleaving environment for acid cleavable linking groups. Examples of acid cleavable linking groups include but are not limited to hydrazones, esters, and esters of amino acids. Acid cleavable groups can have the general formula —C═NN—, C(O)O, or —OC(O). A preferred embodiment is when the carbon attached to the oxygen of the ester (the alkoxy group) is an aryl group, substituted alkyl group, or tertiary alkyl group such as dimethyl pentyl or t-butyl. These candidates can be evaluated using methods analogous to those described above.

In another embodiment, a cleavable linker comprises an ester-based cleavable linking group. An ester-based cleavable linking group is cleaved by enzymes such as esterases and amidases in cells. Examples of ester-based cleavable linking groups include but are not limited to esters of alkylene, alkenylene and alkynylene groups. Ester cleavable linking groups have the general formula —C(O)O—, or —OC(O)—. These candidates can be evaluated using methods analogous to those described above.

In yet another embodiment, a cleavable linker comprises a peptide-based cleavable linking group. A peptide-based cleavable linking group is cleaved by enzymes such as peptidases and proteases in cells. Peptide-based cleavable linking groups are peptide bonds formed between amino acids to yield oligopeptides (e.g., dipeptides, tripeptides etc.) and polypeptides. Peptide-based cleavable groups do not include the amide group (—C(O)NH—). The amide group can be formed between any alkylene, alkenylene or alkynelene. A peptide bond is a special type of amide bond formed between amino acids to yield peptides and proteins. The peptide based cleavage group is generally limited to the peptide bond (i.e., the amide bond) formed between amino acids yielding peptides and proteins and does not include the entire amide functional group. Peptide-based cleavable linking groups have the general formula —NH—CHRAC(O)NHCHRBC(O)— (SEQ ID NO: 13), where RA and RB are the R groups of the two adjacent amino acids. These candidates can be evaluated using methods analogous to those described above.

In one embodiment, a dsRNA of the invention is conjugated to a carbohydrate through a linker. Non-limiting examples of dsRNA carbohydrate conjugates with linkers of the compositions and methods of the invention include, but are not limited to,

when one of X or Y is an oligonucleotide, the other is a hydrogen.

In certain embodiments of the compositions and methods of the invention, a ligand is one or more GalNAc (N-acetylgalactosamine) derivatives attached through a bivalent or trivalent branched linker.

In one embodiment, a dsRNA of the invention is conjugated to a bivalent or trivalent branched linker selected from the group of structures shown in any of formula (XXXI)-(XXXIV):

wherein: q2A, q2B, q3A, q3B, q4A, q4B, q5A, q5B and q5C represent independently for each occurrence 0-20 and wherein the repeating unit can be the same or different;

P^(2A), P^(2B), P^(3A), P^(3B), P^(4A), P^(4B), P^(5A), P^(5B), P^(5C), T^(2A), T^(2B), T^(3A), T^(3B), T^(4A), T^(4B), T^(5B), T^(5C), are each independently for each occurrence absent, CO, NH, O, S, OC(O), NHC(O), CH₂, CH₂NH or CH₂O;

Q^(2A), Q^(2B), Q^(3A), Q^(3B), Q^(4A), Q^(4B), Q^(5A), Q^(5B), Q^(5C) are independently for each occurrence absent, alkylene, substituted alkylene wherein one or more methylenes can be interrupted or terminated by one or more of O, S, S(O), SO₂, N(R^(N)), C(R′)═C(R″), C≡C or C(O);

R^(2A), R^(2B), R^(3A), R^(3B), R^(4A), R^(4B), R^(5A), R^(5B), R^(5C) are each independently for each occurrence absent, NH, O, S, CH₂, C(O)O, C(O)NH, NHCH(R^(a))C(O), —C(O)—CH(R^(a))—NH—, CO, CH═N—O,

or heterocyclyl;

L^(2A), L^(2B), L^(3A), L^(3B), L^(4A), L^(4B), L^(5A), L^(5B) and L^(5C) represent the ligand; i.e. each independently for each occurrence a monosaccharide (such as GalNAc), disaccharide, trisaccharide, tetrasaccharide, oligosaccharide, or polysaccharide; and R^(a) is H or amino acid side chain. Trivalent conjugating GalNAc derivatives are particularly useful for use with RNAi agents for inhibiting the expression of a target gene, such as those of formula (XXXV):

wherein L^(5A), L^(5B) and L^(5C) represent a monosaccharide, such as GalNAc derivative.

Examples of suitable bivalent and trivalent branched linker groups conjugating GalNAc derivatives include, but are not limited to, the structures recited above as formulas II VII, XI, X, and XIII.

Representative U.S. patents that teach the preparation of RNA conjugates include, but are not limited to, U.S. Pat. Nos. 4,828,979; 4,948,882; 5,218,105; 5,525,465; 5,541,313; 5,545,730; 5,552,538; 5,578,717, 5,580,731; 5,591,584; 5,109,124; 5,118,802; 5,138,045; 5,414,077; 5,486,603; 5,512,439; 5,578,718; 5,608,046; 4,587,044; 4,605,735; 4,667,025; 4,762,779; 4,789,737; 4,824,941; 4,835,263; 4,876,335; 4,904,582; 4,958,013; 5,082,830; 5,112,963; 5,214,136; 5,082,830; 5,112,963; 5,214,136; 5,245,022; 5,254,469; 5,258,506; 5,262,536; 5,272,250; 5,292,873; 5,317,098; 5,371,241, 5,391,723; 5,416,203, 5,451,463; 5,510,475; 5,512,667; 5,514,785; 5,565,552; 5,567,810; 5,574,142; 5,585,481; 5,587,371; 5,595,726; 5,597,696; 5,599,923; 5,599,928 and 5,688,941; 6,294,664; 6,320,017; 6,576,752; 6,783,931; 6,900,297; 7,037,646; 8,106,022, the entire contents of each of which are hereby incorporated herein by reference.

Vector Encoded dsRNAs

In another aspect, PROC dsRNA molecules are expressed from transcription units inserted into DNA or RNA vectors (see, e.g., Couture, A, et al., TIG. (1996), 12:5-10; Skillern, A., et al., International PCT Publication No. WO 00/22113, Conrad, International PCT Publication No. WO 00/22114, and Conrad, U.S. Pat. No. 6,054,299). These transgenes can be introduced as a linear construct, a circular plasmid, or a viral vector, which can be incorporated and inherited as a transgene integrated into the host genome. The transgene can also be constructed to permit it to be inherited as an extrachromosomal plasmid (Gassmann, et al., Proc. Natl. Acad. Sci. USA (1995) 92:1292).

The individual strands of a dsRNA can be transcribed by promoters on two separate expression vectors and co-transfected into a target cell. Alternatively each individual strand of the dsRNA can be transcribed by promoters both of which are located on the same expression plasmid. In one embodiment, a dsRNA is expressed as an inverted repeat joined by a linker polynucleotide sequence such that the dsRNA has a stem and loop structure.

The recombinant dsRNA expression vectors are generally DNA plasmids or viral vectors. dsRNA expressing viral vectors can be constructed based on, but not limited to, adeno-associated virus (for a review, see Muzyczka, et al., Curr. Topics Micro. Immunol. (1992) 158:97-129)); adenovirus (see, for example, Berkner, et al., BioTechniques (1998) 6:616), Rosenfeld et al. (1991, Science 252:431-434), and Rosenfeld et al. (1992), Cell 68:143-155)); or alphavirus as well as others known in the art. Retroviruses have been used to introduce a variety of genes into many different cell types, including epithelial cells, in vitro and/or in vivo (see, e.g., Eglitis, et al., Science (1985) 230:1395-1398; Danos and Mulligan, Proc. Natl. Acad. Sci. USA (1998) 85:6460-6464; Wilson et al., 1988, Proc. Natl. Acad. Sci. USA 85:3014-3018; Armentano et al., 1990, Proc. Natl. Acad. Sci. USA 87:61416145; Huber et al., 1991, Proc. Natl. Acad. Sci. USA 88:8039-8043; Ferry et al., 1991, Proc. Natl. Acad. Sci. USA 88:8377-8381; Chowdhury et al., 1991, Science 254:1802-1805; van Beusechem. et al., 1992, Proc. Natl. Acad. Sci. USA 89:7640-19; Kay et al., 1992, Human Gene Therapy 3:641-647; Dai et al., 1992, Proc. Natl. Acad. Sci. USA 89:10892-10895; Hwu et al., 1993, J. Immunol. 150:4104-4115; U.S. Pat. Nos. 4,868,116; 4,980,286; PCT Application WO 89/07136; PCT Application WO 89/02468; PCT Application WO 89/05345; and PCT Application WO 92/07573). Recombinant retroviral vectors capable of transducing and expressing genes inserted into the genome of a cell can be produced by transfecting the recombinant retroviral genome into suitable packaging cell lines such as PA317 and Psi-CRIP (Comette et al., 1991, Human Gene Therapy 2:5-10; Cone et al., 1984, Proc. Natl. Acad. Sci. USA 81:6349). Recombinant adenoviral vectors can be used to infect a wide variety of cells and tissues in susceptible hosts (e.g., rat, hamster, dog, and chimpanzee) (Hsu et al., 1992, J. Infectious Disease, 166:769), and also have the advantage of not requiring mitotically active cells for infection.

Any viral vector capable of accepting the coding sequences for the dsRNA molecule(s) to be expressed can be used, for example vectors derived from adenovirus (AV); adeno-associated virus (AAV); retroviruses (e.g., lentiviruses (LV), Rhabdoviruses, murine leukemia virus); herpes virus, and the like. The tropism of viral vectors can be modified by pseudotyping the vectors with envelope proteins or other surface antigens from other viruses, or by substituting different viral capsid proteins, as appropriate.

For example, lentiviral vectors featured in the invention can be pseudotyped with surface proteins from vesicular stomatitis virus (VSV), rabies, Ebola, Mokola, and the like. AAV vectors featured in the invention can be made to target different cells by engineering the vectors to express different capsid protein serotypes. For example, an AAV vector expressing a serotype 2 capsid on a serotype 2 genome is called AAV 2/2. This serotype 2 capsid gene in the AAV 2/2 vector can be replaced by a serotype 5 capsid gene to produce an AAV 2/5 vector. Techniques for constructing AAV vectors which express different capsid protein serotypes are within the skill in the art; see, e.g., Rabinowitz J E et al. (2002), J Virol 76:791-801, the entire disclosure of which is herein incorporated by reference.

Selection of recombinant viral vectors suitable for use in the invention, methods for inserting nucleic acid sequences for expressing the dsRNA into the vector, and methods of delivering the viral vector to the cells of interest are within the skill in the art. See, for example, Dornburg R (1995), Gene Therap. 2: 301-310; Eglitis M A (1988), Biotechniques 6: 608-614; Miller A D (1990), Hum Gene Therap. 1: 5-14; Anderson W F (1998), Nature 392: 25-30; and Rubinson D A et al., Nat. Genet. 33: 401-406, the entire disclosures of which are herein incorporated by reference.

Viral vectors can be derived from AV and AAV. In one embodiment, the dsRNA featured in the invention is expressed as two separate, complementary single-stranded RNA molecules from a recombinant AAV vector having, for example, either the U6 or H1 RNA promoters, or the cytomegalovirus (CMV) promoter.

A suitable AV vector for expressing the dsRNA featured in the invention, a method for constructing the recombinant AV vector, and a method for delivering the vector into target cells, are described in Xia H et al. (2002), Nat. Biotech. 20: 1006-1010.

Suitable AAV vectors for expressing the dsRNA featured in the invention, methods for constructing the recombinant AV vector, and methods for delivering the vectors into target cells are described in Samulski R et al. (1987), J. Virol. 61: 3096-3101; Fisher K J et al. (1996), J. Virol, 70: 520-532; Samulski R et al. (1989), J. Virol. 63: 3822-3826; U.S. Pat. Nos. 5,252,479; 5,139,941; International Patent Application No. WO 94/13788; and International Patent Application No. WO 93/24641, the entire disclosures of which are herein incorporated by reference.

The promoter driving dsRNA expression in either a DNA plasmid or viral vector featured in the invention may be a eukaryotic RNA polymerase I (e.g., ribosomal RNA promoter), RNA polymerase II (e.g., CMV early promoter or actin promoter or U1 snRNA promoter) or generally RNA polymerase III promoter (e.g., U6 snRNA or 7SK RNA promoter) or a prokaryotic promoter, for example the T7 promoter, provided the expression plasmid also encodes T7 RNA polymerase required for transcription from a T7 promoter. The promoter can also direct transgene expression to the pancreas (see, e.g., the insulin regulatory sequence for pancreas (Bucchini et al., 1986, Proc. Natl. Acad. Sci. USA 83:2511-2515)).

In addition, expression of the transgene can be precisely regulated, for example, by using an inducible regulatory sequence and expression systems such as a regulatory sequence that is sensitive to certain physiological regulators, e.g., circulating glucose levels, or hormones (Docherty et al., 1994, FASEB J. 8:20-24). Such inducible expression systems, suitable for the control of transgene expression in cells or in mammals include regulation by ecdysone, by estrogen, progesterone, tetracycline, chemical inducers of dimerization, and isopropyl-beta-D1-thiogalactopyranoside (EPTG). A person skilled in the art would be able to choose the appropriate regulatory/promoter sequence based on the intended use of the dsRNA transgene.

Generally, recombinant vectors capable of expressing dsRNA molecules are delivered as described below, and persist in target cells. Alternatively, viral vectors can be used that provide for transient expression of dsRNA molecules. Such vectors can be repeatedly administered as necessary. Once expressed, the dsRNAs bind to target RNA and modulate its function or expression. Delivery of dsRNA expressing vectors can be systemic, such as by intravenous or intramuscular administration, by administration to target cells ex-planted from the patient followed by reintroduction into the patient, or by any other means that allows for introduction into a desired target cell.

dsRNA expression DNA plasmids are typically transfected into target cells as a complex with cationic lipid carriers (e.g., Oligofectamine) or non-cationic lipid-based carriers (e.g., Transit-TKO™). Multiple lipid transfections for dsRNA-mediated knockdowns targeting different regions of a single PROC gene or multiple PROC genes over a period of a week or more are also contemplated by the invention. Successful introduction of vectors into host cells can be monitored using various known methods. For example, transient transfection can be signaled with a reporter, such as a fluorescent marker, such as Green Fluorescent Protein (GFP). Stable transfection of cells ex vivo can be ensured using markers that provide the transfected cell with resistance to specific environmental factors (e.g., antibiotics and drugs), such as hygromycin B resistance.

PROC specific dsRNA molecules can also be inserted into vectors and used as gene therapy vectors for human patients. Gene therapy vectors can be delivered to a subject by, for example, intravenous injection, local administration (see U.S. Pat. No. 5,328,470) or by stereotactic injection (see e.g., Chen et al. (1994) Proc. Natl. Acad. Sci. USA 91:3054-3057). The pharmaceutical preparation of the gene therapy vector can include the gene therapy vector in an acceptable diluent, or can include a slow release matrix in which the gene delivery vehicle is imbedded. Alternatively, where the complete gene delivery vector can be produced intact from recombinant cells, e.g., retroviral vectors, the pharmaceutical preparation can include one or more cells which produce the gene delivery system.

III. Pharmaceutical Compositions Containing dsRNA

In one embodiment, the invention provides pharmaceutical compositions containing a dsRNA, as described herein, and a pharmaceutically acceptable carrier. The pharmaceutical composition containing the dsRNA is useful for treating a disease or disorder associated with the expression or activity of a PROC gene, such as pathological processes mediated by PROC expression. Such pharmaceutical compositions are formulated based on the mode of delivery.

The pharmaceutical compositions featured herein are administered in dosages sufficient to inhibit expression of PROC genes.

Subjects can be administered a therapeutic amount of dsRNA, such as about 0.01 mg/kg, 0.02 mg/kg, 0.03 mg/kg, 0.04 mg/kg, 0.05 mg/kg, 0.06 mg/kg, 0.07 mg/kg, 0.08 mg/kg, 0.09 mg/kg, 0.1 mg/kg, 0.15 mg/kg, 0.2 mg/kg, 0.25 mg/kg, 0.3 mg/kg, 0.35 mg/kg, 0.4 mg/kg, 0.45 mg/kg, 0.5 mg/kg, 0.55 mg/kg, 0.6 mg/kg, 0.65 mg/kg, 0.7 mg/kg, 0.75 mg/kg, 0.8 mg/kg, 0.85 mg/kg, 0.9 mg/kg, 0.95 mg/kg, 1.0 mg/kg, 1.1 mg/kg, 1.2 mg/kg, 1.3 mg/kg, 1.4 mg/kg, 1.5 mg/kg, 1.6 mg/kg, 1.7 mg/kg, 1.8 mg/kg, 1.9 mg/kg, 2.0 mg/kg, 2.1 mg/kg, 2.2 mg/kg, 2.3 mg/kg, 2.4 mg/kg, 2.5 mg/kg dsRNA, 2.6 mg/kg dsRNA, 2.7 mg/kg dsRNA, 2.8 mg/kg dsRNA, 2.9 mg/kg dsRNA, 3.0 mg/kg dsRNA, 3.1 mg/kg dsRNA, 3.2 mg/kg dsRNA, 3.3 mg/kg dsRNA, 3.4 mg/kg dsRNA, 3.5 mg/kg dsRNA, 3.6 mg/kg dsRNA, 3.7 mg/kg dsRNA, 3.8 mg/kg dsRNA, 3.9 mg/kg dsRNA, 4.0 mg/kg dsRNA, 4.1 mg/kg dsRNA, 4.2 mg/kg dsRNA, 4.3 mg/kg dsRNA, 4.4 mg/kg dsRNA, 4.5 mg/kg dsRNA, 4.6 mg/kg dsRNA, 4.7 mg/kg dsRNA, 4.8 mg/kg dsRNA, 4.9 mg/kg dsRNA, 5.0 mg/kg dsRNA, 5.1 mg/kg dsRNA, 5.2 mg/kg dsRNA, 5.3 mg/kg dsRNA, 5.4 mg/kg dsRNA, 5.5 mg/kg dsRNA, 5.6 mg/kg dsRNA, 5.7 mg/kg dsRNA, 5.8 mg/kg dsRNA, 5.9 mg/kg dsRNA, 6.0 mg/kg dsRNA, 6.1 mg/kg dsRNA, 6.2 mg/kg dsRNA, 6.3 mg/kg dsRNA, 6.4 mg/kg dsRNA, 6.5 mg/kg dsRNA, 6.6 mg/kg dsRNA, 6.7 mg/kg dsRNA, 6.8 mg/kg dsRNA, 6.9 mg/kg dsRNA, 7.0 mg/kg dsRNA, 7.1 mg/kg dsRNA, 7.2 mg/kg dsRNA, 7.3 mg/kg dsRNA, 7.4 mg/kg dsRNA, 7.5 mg/kg dsRNA, 7.6 mg/kg dsRNA, 7.7 mg/kg dsRNA, 7.8 mg/kg dsRNA, 7.9 mg/kg dsRNA, 8.0 mg/kg dsRNA, 8.1 mg/kg dsRNA, 8.2 mg/kg dsRNA, 8.3 mg/kg dsRNA, 8.4 mg/kg dsRNA, 8.5 mg/kg dsRNA, 8.6 mg/kg dsRNA, 8.7 mg/kg dsRNA, 8.8 mg/kg dsRNA, 8.9 mg/kg dsRNA, 9.0 mg/kg dsRNA, 9.1 mg/kg dsRNA, 9.2 mg/kg dsRNA, 9.3 mg/kg dsRNA, 9.4 mg/kg dsRNA, 9.5 mg/kg dsRNA, 9.6 mg/kg dsRNA, 9.7 mg/kg dsRNA, 9.8 mg/kg dsRNA, 9.9 mg/kg dsRNA, 9.0 mg/kg dsRNA, 10 mg/kg dsRNA, 15 mg/kg dsRNA, 20 mg/kg dsRNA, 25 mg/kg dsRNA, 30 mg/kg dsRNA, 35 mg/kg dsRNA, 40 mg/kg dsRNA, 45 mg/kg dsRNA, or about 50 mg/kg dsRNA. Values and ranges intermediate to the recited values are also intended to be part of this invention.

The pharmaceutical composition may be administered once daily or the dsRNA may be administered as two, three, or more sub-doses at appropriate intervals throughout the day or even using continuous infusion or delivery through a controlled release formulation. In that case, the dsRNA contained in each sub-dose must be correspondingly smaller in order to achieve the total daily dosage. The dosage unit can also be compounded for delivery over several days, e.g., using a conventional sustained release formulation which provides sustained release of the dsRNA over a several day period. Sustained release formulations are well known in the art and are particularly useful for delivery of agents at a particular site, such as could be used with the agents of the present invention. In this embodiment, the dosage unit contains a corresponding multiple of the daily dose.

The effect of a single dose on PROC levels is long lasting, such that subsequent doses are administered at not more than 3, 4, or 5 day intervals, or at not more than 1, 2, 3, or 4 week intervals, or at not more than 5, 6, 7, 8, 9, or 10 week intervals.

The skilled artisan will appreciate that certain factors may influence the dosage and timing required to effectively treat a subject, including but not limited to the severity of the disease or disorder, previous treatments, the general health and/or age of the subject, and other diseases present. Moreover, treatment of a subject with a therapeutically effective amount of a composition can include a single treatment or a series of treatments. Estimates of effective dosages and in vivo half-lives for the individual dsRNAs encompassed by the invention can be made using conventional methodologies or on the basis of in vivo testing using an appropriate animal model, as described elsewhere herein.

Advances in mouse genetics have generated a number of mouse models for the study of various human diseases, such as pathological processes mediated by PROC expression. Such models are used for in vivo testing of dsRNA, as well as for determining a therapeutically effective dose. A suitable mouse model is, for example, a mouse containing a plasmid expressing human PROC. Another suitable mouse model is a transgenic mouse carrying a transgene that expresses human PROC.

The data obtained from cell culture assays and animal studies can be used in formulating a range of dosage for use in humans. The dosage of compositions featured in the invention lies generally within a range of circulating concentrations that include the ED50 with little or no toxicity. The dosage may vary within this range depending upon the dosage form employed and the route of administration utilized. For any compound used in the methods featured in the invention, the therapeutically effective dose can be estimated initially from cell culture assays. A dose may be formulated in animal models to achieve a circulating plasma concentration range of the compound or, when appropriate, of the polypeptide product of a target sequence (e.g., achieving a decreased concentration of the polypeptide) that includes the IC50 (i.e., the concentration of the test compound which achieves a half-maximal inhibition of symptoms) as determined in cell culture. Such information can be used to more accurately determine useful doses in humans. Levels in plasma may be measured, for example, by high performance liquid chromatography.

The dsRNAs featured in the invention can be administered in combination with other known agents effective in treatment of pathological processes mediated by target gene expression. In any event, the administering physician can adjust the amount and timing of dsRNA administration on the basis of results observed using standard measures of efficacy known in the art or described herein.

Administration

The present invention also includes pharmaceutical compositions and formulations which include the dsRNA compounds featured in the invention. The pharmaceutical compositions of the present invention may be administered in a number of ways depending upon whether local or systemic treatment is desired and upon the area to be treated. Administration may be topical (including buccal and sublingual), pulmonary, e.g., by inhalation or insufflation of powders or aerosols, including by nebulizer; intratracheal, intranasal, epidermal and transdermal, oral or parenteral. Parenteral administration includes intravenous, intraarterial, subcutaneous, intraperitoneal or intramuscular injection or infusion; or intracranial, e.g., intraparenchymal, intrathecal or intraventricular, administration.

The dsRNA can be delivered in a manner to target a particular tissue.

Pharmaceutical compositions and formulations for topical administration may include transdermal patches, ointments, lotions, creams, gels, drops, suppositories, sprays, liquids and powders. Conventional pharmaceutical carriers, aqueous, powder or oily bases, thickeners and the like may be necessary or desirable. Coated condoms, gloves and the like may also be useful. Suitable topical formulations include those in which the dsRNAs featured in the invention are in admixture with a topical delivery agent such as lipids, liposomes, fatty acids, fatty acid esters, steroids, chelating agents and surfactants. Suitable lipids and liposomes include neutral (e.g., dioleoylphosphatidyl DOPE ethanolamine, dimyristoylphosphatidyl choline DMPC, distearoylphosphatidyl choline) negative (e.g., dimyristoylphosphatidyl glycerol DMPG) and cationic (e.g., dioleoyltetramethylaminopropyl DOTAP and dioleoylphosphatidyl ethanolamine DOTMA). DsRNAs featured in the invention may be encapsulated within liposomes or may form complexes thereto, in particular to cationic liposomes. Alternatively, dsRNAs may be complexed to lipids, in particular to cationic lipids. Suitable fatty acids and esters include but are not limited to arachidonic acid, oleic acid, eicosanoic acid, lauric acid, caprylic acid, capric acid, myristic acid, palmitic acid, stearic acid, linoleic acid, linolenic acid, dicaprate, tricaprate, monoolein, dilaurin, glyceryl 1-monocaprate, 1-dodecylazacycloheptan-2-one, an acylcarnitine, an acylcholine, or a C₁₋₁₀ alkyl ester (e.g., isopropylmyristate IPM), monoglyceride, diglyceride or pharmaceutically acceptable salt thereof. Topical formulations are described in detail in U.S. Pat. No. 6,747,014, which is incorporated herein by reference.

Liposomal Formulations

There are many organized surfactant structures besides microemulsions that have been studied and used for the formulation of drugs. These include monolayers, micelles, bilayers and vesicles. Vesicles, such as liposomes, have attracted great interest because of their specificity and the duration of action they offer from the standpoint of drug delivery. As used in the present invention, the term “liposome” means a vesicle composed of amphiphilic lipids arranged in a spherical bilayer or bilayers.

Liposomes are unilamellar or multilamellar vesicles which have a membrane formed from a lipophilic material and an aqueous interior. The aqueous portion contains the composition to be delivered. Cationic liposomes possess the advantage of being able to fuse to the cell wall. Non-cationic liposomes, although not able to fuse as efficiently with the cell wall, are taken up by macrophages in vivo.

In order to cross intact mammalian skin, lipid vesicles must pass through a series of fine pores, each with a diameter less than 50 nm, under the influence of a suitable transdermal gradient. Therefore, it is desirable to use a liposome which is highly deformable and able to pass through such fine pores.

Further advantages of liposomes include; liposomes obtained from natural phospholipids are biocompatible and biodegradable; liposomes can incorporate a wide range of water and lipid soluble drugs; liposomes can protect encapsulated drugs in their internal compartments from metabolism and degradation (Rosoff, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 245). Important considerations in the preparation of liposome formulations are the lipid surface charge, vesicle size and the aqueous volume of the liposomes.

Liposomes are useful for the transfer and delivery of active ingredients to the site of action. Because the liposomal membrane is structurally similar to biological membranes, when liposomes are applied to a tissue, the liposomes start to merge with the cellular membranes and as the merging of the liposome and cell progresses, the liposomal contents are emptied into the cell where the active agent may act.

Liposomal formulations have been the focus of extensive investigation as the mode of delivery for many drugs. There is growing evidence that for topical administration, liposomes present several advantages over other formulations. Such advantages include reduced side-effects related to high systemic absorption of the administered drug, increased accumulation of the administered drug at the desired target, and the ability to administer a wide variety of drugs, both hydrophilic and hydrophobic, into the skin.

Several reports have detailed the ability of liposomes to deliver agents including high-molecular weight DNA into the skin. Compounds including analgesics, antibodies, hormones and high-molecular weight DNAs have been administered to the skin. The majority of applications resulted in the targeting of the upper epidermis

Liposomes fall into two broad classes. Cationic liposomes are positively charged liposomes which interact with the negatively charged DNA molecules to form a stable complex. The positively charged DNA/liposome complex binds to the negatively charged cell surface and is internalized in an endosome. Due to the acidic pH within the endosome, the liposomes are ruptured, releasing their contents into the cell cytoplasm (Wang et al., Biochem. Biophys. Res. Commun., 1987, 147, 980-985).

Liposomes which are pH-sensitive or negatively-charged, entrap DNA rather than complex with it. Since both the DNA and the lipid are similarly charged, repulsion rather than complex formation occurs. Nevertheless, some DNA is entrapped within the aqueous interior of these liposomes. pH-sensitive liposomes have been used to deliver DNA encoding the thymidine kinase gene to cell monolayers in culture. Expression of the exogenous gene was detected in the target cells (Zhou et al., Journal of Controlled Release, 1992, 19, 269-274).

One major type of liposomal composition includes phospholipids other than naturally-derived phosphatidylcholine. Neutral liposome compositions, for example, can be formed from dimyristoyl phosphatidylcholine (DMPC) or dipalmitoyl phosphatidylcholine (DPPC). Anionic liposome compositions generally are formed from dimyristoyl phosphatidylglycerol, while anionic fusogenic liposomes are formed primarily from dioleoyl phosphatidylethanolamine (DOPE). Another type of liposomal composition is formed from phosphatidylcholine (PC) such as, for example, soybean PC, and egg PC. Another type is formed from mixtures of phospholipid and/or phosphatidylcholine and/or cholesterol.

Several studies have assessed the topical delivery of liposomal drug formulations to the skin. Application of liposomes containing interferon to guinea pig skin resulted in a reduction of skin herpes sores while delivery of interferon via other means (e.g., as a solution or as an emulsion) were ineffective (Weiner et al., Journal of Drug Targeting, 1992, 2, 405-410). Further, an additional study tested the efficacy of interferon administered as part of a liposomal formulation to the administration of interferon using an aqueous system, and concluded that the liposomal formulation was superior to aqueous administration (du Plessis et al., Antiviral Research, 1992, 18, 259-265).

Non-ionic liposomal systems have also been examined to determine their utility in the delivery of drugs to the skin, in particular systems comprising non-ionic surfactant and cholesterol. Non-ionic liposomal formulations comprising Novasome™ I (glyceryl dilaurate/cholesterol/polyoxyethylene-10-stearyl ether) and Novasome™ II (glyceryl distearate/cholesterol/polyoxyethylene-10-stearyl ether) were used to deliver cyclosporin-A into the dermis of mouse skin. Results indicated that such non-ionic liposomal systems were effective in facilitating the deposition of cyclosporin-A into different layers of the skin (Hu et al. S.T.P.Pharma. Sci., 1994, 4, 6, 466).

Liposomes also include “sterically stabilized” liposomes, a term which, as used herein, refers to liposomes comprising one or more specialized lipids that, when incorporated into liposomes, result in enhanced circulation lifetimes relative to liposomes lacking such specialized lipids. Examples of sterically stabilized liposomes are those in which part of the vesicle-forming lipid portion of the liposome (A) comprises one or more glycolipids, such as monosialoganglioside G_(M1), or (B) is derivatized with one or more hydrophilic polymers, such as a polyethylene glycol (PEG) moiety. While not wishing to be bound by any particular theory, it is thought in the art that, at least for sterically stabilized liposomes containing gangliosides, sphingomyelin, or PEG-derivatized lipids, the enhanced circulation half-life of these sterically stabilized liposomes derives from a reduced uptake into cells of the reticuloendothelial system (RES) (Allen et al., FEBS Letters, 1987, 223, 42; Wu et al., Cancer Research, 1993, 53, 3765).

Various liposomes comprising one or more glycolipids are known in the art. Papahadjopoulos et al. (Ann. N.Y. Acad. Sci., 1987, 507, 64) reported the ability of monosialoganglioside G_(M1), galactocerebroside sulfate and phosphatidylinositol to improve blood half-lives of liposomes. These findings were expounded upon by Gabizon et al. (Proc. Natl. Acad. Sci. U.S.A., 1988, 85, 6949). U.S. Pat. No. 4,837,028 and WO 88/04924, both to Allen et al., disclose liposomes comprising (1) sphingomyelin and (2) the ganglioside G_(M1) or a galactocerebroside sulfate ester. U.S. Pat. No. 5,543,152 (Webb et al.) discloses liposomes comprising sphingomyelin. Liposomes comprising 1,2-sn-dimyristoylphosphatidylcholine are disclosed in WO 97/13499 (Lim et al).

Many liposomes comprising lipids derivatized with one or more hydrophilic polymers, and methods of preparation thereof, are known in the art. Sunamoto et al. (Bull. Chem. Soc. Jpn., 1980, 53, 2778) described liposomes comprising a nonionic detergent, 2C_(1215G), that contains a PEG moiety. Illum et al. (FEBS Lett., 1984, 167, 79) noted that hydrophilic coating of polystyrene particles with polymeric glycols results in significantly enhanced blood half-lives. Synthetic phospholipids modified by the attachment of carboxylic groups of polyalkylene glycols (e.g., PEG) are described by Sears (U.S. Pat. Nos. 4,426,330 and 4,534,899). Klibanov et al. (FEBS Lett., 1990, 268, 235) described experiments demonstrating that liposomes comprising phosphatidylethanolamine (PE) derivatized with PEG or PEG stearate have significant increases in blood circulation half-lives. Blume et al. (Biochimica et Biophysica Acta, 1990, 1029, 91) extended such observations to other PEG-derivatized phospholipids, e.g., DSPE-PEG, formed from the combination of distearoylphosphatidylethanolamine (DSPE) and PEG. Liposomes having covalently bound PEG moieties on their external surface are described in European Patent No. EP 0 445 131 B1 and WO 90/04384 to Fisher. Liposome compositions containing 1-20 mole percent of PE derivatized with PEG, and methods of use thereof, are described by Woodle et al. (U.S. Pat. Nos. 5,013,556 and 5,356,633) and Martin et al. (U.S. Pat. No. 5,213,804 and European Patent No. EP 0 496 813 B1). Liposomes comprising a number of other lipid-polymer conjugates are disclosed in WO 91/05545 and U.S. Pat. No. 5,225,212 (both to Martin et al.) and in WO 94/20073 (Zalipsky et al.) Liposomes comprising PEG-modified ceramide lipids are described in WO 96/10391 (Choi et al). U.S. Pat. No. 5,540,935 (Miyazaki et al.) and U.S. Pat. No. 5,556,948 (Tagawa et al.) describe PEG-containing liposomes that can be further derivatized with functional moieties on their surfaces.

A number of liposomes comprising nucleic acids are known in the art. WO 96/40062 to Thierry et al. discloses methods for encapsulating high molecular weight nucleic acids in liposomes. U.S. Pat. No. 5,264,221 to Tagawa et al. discloses protein-bonded liposomes and asserts that the contents of such liposomes may include a dsRNA. U.S. Pat. No. 5,665,710 to Rahman et al. describes certain methods of encapsulating oligodeoxynucleotides in liposomes. WO 97/04787 to Love et al. discloses liposomes comprising dsRNAs targeted to the raf gene.

Transfersomes are yet another type of liposomes, and are highly deformable lipid aggregates which are attractive candidates for drug delivery vehicles. Transfersomes may be described as lipid droplets which are so highly deformable that they are easily able to penetrate through pores which are smaller than the droplet. Transfersomes are adaptable to the environment in which they are used, e.g., they are self-optimizing (adaptive to the shape of pores in the skin), self-repairing, frequently reach their targets without fragmenting, and often self-loading. To make transfersomes it is possible to add surface edge-activators, usually surfactants, to a standard liposomal composition. Transfersomes have been used to deliver serum albumin to the skin. The transfersome-mediated delivery of serum albumin has been shown to be as effective as subcutaneous injection of a solution containing serum albumin.

Surfactants find wide application in formulations such as emulsions (including microemulsions) and liposomes. The most common way of classifying and ranking the properties of the many different types of surfactants, both natural and synthetic, is by the use of the hydrophile/lipophile balance (HLB). The nature of the hydrophilic group (also known as the “head”) provides the most useful means for categorizing the different surfactants used in formulations (Rieger, in Pharmaceutical Dosage Forms, Marcel Dekker, Inc., New York, N.Y., 1988, p. 285).

If the surfactant molecule is not ionized, it is classified as a nonionic surfactant. Nonionic surfactants find wide application in pharmaceutical and cosmetic products and are usable over a wide range of pH values. In general their HLB values range from 2 to about 18 depending on their structure. Nonionic surfactants include nonionic esters such as ethylene glycol esters, propylene glycol esters, glyceryl esters, polyglyceryl esters, sorbitan esters, sucrose esters, and ethoxylated esters. Nonionic alkanolamides and ethers such as fatty alcohol ethoxylates, propoxylated alcohols, and ethoxylated/propoxylated block polymers are also included in this class. The polyoxyethylene surfactants are the most popular members of the nonionic surfactant class.

If the surfactant molecule carries a negative charge when it is dissolved or dispersed in water, the surfactant is classified as anionic. Anionic surfactants include carboxylates such as soaps, acyl lactylates, acyl amides of amino acids, esters of sulfuric acid such as alkyl sulfates and ethoxylated alkyl sulfates, sulfonates such as alkyl benzene sulfonates, acyl isethionates, acyl taurates and sulfosuccinates, and phosphates. The most important members of the anionic surfactant class are the alkyl sulfates and the soaps.

If the surfactant molecule carries a positive charge when it is dissolved or dispersed in water, the surfactant is classified as cationic. Cationic surfactants include quaternary ammonium salts and ethoxylated amines. The quaternary ammonium salts are the most used members of this class.

If the surfactant molecule has the ability to carry either a positive or negative charge, the surfactant is classified as amphoteric. Amphoteric surfactants include acrylic acid derivatives, substituted alkylamides, N-alkylbetaines and phosphatides.

The use of surfactants in drug products, formulations and in emulsions has been reviewed (Rieger, in Pharmaceutical Dosage Forms, Marcel Dekker, Inc., New York, N.Y., 1988, p. 285).

Nucleic Acid Lipid Particles

In one embodiment, a PROC dsRNA featured in the invention is fully encapsulated in the lipid formulation, e.g., to form a SPLP, pSPLP, SNALP, or other nucleic acid-lipid particle. As used herein, the term “SNALP” refers to a stable nucleic acid-lipid particle, including SPLP. As used herein, the term “SPLP” refers to a nucleic acid-lipid particle comprising plasmid DNA encapsulated within a lipid vesicle. SNALPs and SPLPs typically contain a cationic lipid, a non-cationic lipid, and a lipid that prevents aggregation of the particle (e.g., a PEG-lipid conjugate). SNALPs and SPLPs are extremely useful for systemic applications, as they exhibit extended circulation lifetimes following intravenous (i.v.) injection and accumulate at distal sites (e.g., sites physically separated from the administration site). SPLPs include “pSPLP,” which include an encapsulated condensing agent-nucleic acid complex as set forth in PCT Publication No. WO 00/03683. The particles of the present invention typically have a mean diameter of about 50 nm to about 150 nm, more typically about 60 nm to about 130 nm, more typically about 70 nm to about 110 nm, most typically about 70 nm to about 90 nm, and are substantially nontoxic. In addition, the nucleic acids when present in the nucleic acid-lipid particles of the present invention are resistant in aqueous solution to degradation with a nuclease. Nucleic acid-lipid particles and their method of preparation are disclosed in, e.g., U.S. Pat. Nos. 5,976,567; 5,981,501; 6,534,484; 6,586,410; 6,815,432; and PCT Publication No. WO 96/40964.

In one embodiment, the lipid to drug ratio (mass/mass ratio) (e.g., lipid to dsRNA ratio) will be in the range of from about 1:1 to about 50:1, from about 1:1 to about 25:1, from about 3:1 to about 15:1, from about 4:1 to about 10:1, from about 5:1 to about 9:1, or about 6:1 to about 9:1. In some embodiments the lipid to dsRNA ratio can be about 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, or 11:1.

In general, the lipid-nucleic acid particle is suspended in a buffer, e.g., PBS, for administration. In one embodiment, the pH of the lipid formulated siRNA is between 6.8 and 7.8, e.g., 7.3 or 7.4. The osmolality can be, e.g., between 250 and 350 mOsm/kg, e.g., around 300, e.g., 298, 299, 300, 301, 302, 303, 304, or 305.

The cationic lipid may be, for example, N,N-dioleyl-N,N-dimethylammonium chloride (DODAC), N,N-distearyl-N,N-dimethylammonium bromide (DDAB), N-(1-(2,3-dioleoyloxy)propyl)-N,N,N-trimethylammonium chloride (DOTAP), N-(1-(2,3-dioleyloxy)propyl)-N,N,N-trimethylammonium chloride (DOTMA), N,N-dimethyl-2,3-dioleyloxy)propylamine (DODMA), 1,2-DiLinoleyloxy-N,N-dimethylaminopropane (DLinDMA), 1,2-Dilinolenyloxy-N,N-dimethylaminopropane (DLenDMA), 1,2-Dilinoleylcarbamoyloxy-3-dimethylaminopropane (DLin-C-DAP), 1,2-Dilinoleyoxy-3-(dimethylamino)acetoxypropane (DLin-DAC), 1,2-Dilinoleyoxy-3-morpholinopropane (DLin-MA), 1,2-Dilinoleoyl-3-dimethylaminopropane (DLinDAP), 1,2-Dilinoleylthio-3-dimethylaminopropane (DLin-SDMA), 1-Linoleoyl-2-linoleyloxy-3-dimethylaminopropane (DLin-2-DMAP), 1,2-Dilinoleyloxy-3-trimethylaminopropane chloride salt (DLin-TMA.Cl), 1,2-Dilinoleoyl-3-trimethylaminopropane chloride salt (DLin-TAP.Cl), 1,2-Dilinoleyloxy-3-(Nmethylpiperazino)propane (DLin-MPZ), or 3-(N,N-Dilinoleylamino)-1,2-propanediol (DLinAP), 3-(N,N-Dioleylamino)-1,2-propanedio (DOAP), 1,2-Dilinoleyloxo-3-(2-N,N-dimethylamino)ethoxypropane (DLin-EG-DMA), 1,2-Dilinolenyloxy-N,N-dimethylaminopropane (DLinDMA), 2,2-Dilinoleyl-4-dimethylaminomethyl-[1,3]-dioxolane (DLin-K-DMA) or analogs thereof, (3aR,5s,6aS)-N,N-dimethyl-2,2-di((9Z,12Z)-octadeca-9,12-dienyl)tetrahydro-3aH-cyclopenta[d][1,3]dioxol-5-amine (ALN100), (6Z,9Z,28Z,31Z)heptatriaconta-6,9,28,31-tetraen-19-yl 4-(dimethylamino)butanoate (MC3), 1,1′-(2-(4-(2-((2-(bis(2-hydroxydodecyl)amino)ethyl)(2-hydroxydodecyl)amino)ethyl)piperazin-1-yl)ethylazanediyl)didodecan-2-ol (C12-200 or Tech G1), or a mixture thereof. The cationic lipid may comprise from about 20 mol % to about 50 mol % or about 40 mol % of the total lipid present in the particle.

The non-cationic lipid may be an anionic lipid or a neutral lipid including, but not limited to, distearoylphosphatidylcholine (DSPC), dioleoylphosphatidylcholine (DOPC), dipalmitoylphosphatidylcholine (DPPC), dioleoylphosphatidylglycerol (DOPG), dipalmitoylphosphatidylglycerol (DPPG), dioleoyl-phosphatidylethanolamine (DOPE), palmitoyloleoylphosphatidylcholine (POPC), palmitoyloleoylphosphatidylethanolamine (POPE), dioleoyl-phosphatidylethanolamine 4-(N-maleimidomethyl)-cyclohexane-1-carboxylate (DOPE-mal), dipalmitoyl phosphatidyl ethanolamine (DPPE), dimyristoylphosphoethanolamine (DMPE), distearoylphosphatidyl-ethanolamine (DSPE), 16-O-monomethyl PE, 16-O-dimethyl PE, 18-1-trans PE, 1-stearoyl-2-oleoyl-phosphatidyethanolamine (SOPE), cholesterol, or a mixture thereof. The non-cationic lipid may be from about 5 mol % to about 90 mol %, about 10 mol %, or about 58 mol % if cholesterol is included, of the total lipid present in the particle.

The conjugated lipid that inhibits aggregation of particles may be, for example, a polyethyleneglycol (PEG)-lipid including, without limitation, a PEG-diacylglycerol (DAG), a PEG-dialkyloxypropyl (DAA), a PEG-phospholipid, a PEG-ceramide (Cer), or a mixture thereof. The PEG-DAA conjugate may be, for example, a PEG-dilauryloxypropyl (Ci₂), a PEGdimyristyloxypropyl (Ci₄), a PEG-dipalmityloxypropyl (C1₆), or a PEG-distearyloxypropyl (C₁₈). Other examples of PEG conjugates include PEG-cDMA (N-[(methoxy poly(ethylene glycol)2000)carbamyl]-1,2-dimyristyloxlpropyl-3-amine), mPEG2000-DMG (mPEGdimyrystylglycerol (with an average molecular weight of 2,000) and PEG-C-DOMG (R-3-[(ω-methoxy-poly(ethylene glycol)2000)carbamoyl)]-1,2-dimyristyloxlpropyl-3-amine). The conjugated lipid that prevents aggregation of particles may be from 0 mol % to about 20 mol % or about 1.0, 1.1., 1.2, 0.13, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2 mol % of the total lipid present in the particle.

In some embodiments, the nucleic acid-lipid particle further includes cholesterol at, e.g., about 10 mol % to about 60 mol % or about 48 mol % of the total lipid present in the particle.

In one embodiment, the compound 2,2-Dilinoleyl-4-dimethylaminoethyl-[1,3]-dioxolane can be used to prepare lipid-siRNA nanoparticles. Synthesis of 2,2-Dilinoleyl-4-dimethylaminoethyl-[1,3]-dioxolane is described in U.S. provisional patent application No. 61/107,998 filed on Oct. 23, 2008, which is herein incorporated by reference.

For example, the lipid-siRNA particle can include 40% 2,2-Dilinoleyl-4-dimethylaminoethyl-[1,3]-dioxolane: 10% DSPC: 40% Cholesterol: 10% PEG-C-DOMG (mole percent) with a particle size of 63.0±20 nm and a 0.027 siRNA/Lipid Ratio.

In still another embodiment, the compound 1,1′-(2-(4-(2-((2-(bis(2-hydroxydodecyl)amino)ethyl)(2-hydroxydodecyl)amino)ethyl)piperazin-1-yl)ethylazanediyl)didodecan-2-ol (Tech G1) can be used to prepare lipid-siRNA particles. For example, the dsRNA can be formulated in a lipid formulation comprising Tech-G1, distearoyl phosphatidylcholine (DSPC), cholesterol and mPEG2000-DMG at a molar ratio of 50:10:38.5:1.5 at a total lipid to siRNA ratio of 7:1 (wt:wt).

LNP01

In one embodiment, the lipidoid ND98.4HCl (MW 1487) (Formula 1), Cholesterol (Sigma-Aldrich), and PEG-Ceramide C16 (Avanti Polar Lipids) can be used to prepare lipid-siRNA nanoparticles (i.e., LNP01 particles).

LNP01 formulations are described, e.g., in International Application Publication No. WO 2008/042973, which is hereby incorporated by reference.

Additional exemplary formulations are described in Table A.

TABLE A cationic lipid/non-cationic lipid/ cholesterol/PEG-lipid conjugate Cationic Mol % ratios Lipid Lipid:siRNA ratio SNALP DLinDMA DLinDMA/DPPC/Cholesterol/PEG-cDMA (57.1/7.1/34.4/1.4) lipid:siRNA ~7:1 S-XTC XTC XTC/DPPC/Cholesterol/PEG-cDMA 57.1/7.1/34.4/1.4 lipid:siRNA ~7:1 LNP05 XTC XTC/DSPC/Cholesterol/PEG-DMG 57.5/7.5/31.5/3.5 lipid:siRNA ~6:1 LNP06 XTC XTC/DSPC/Cholesterol/PEG-DMG 57.5/7.5/31.5/3.5 lipid:siRNA ~11:1 LNP07 XTC XTC/DSPC/Cholesterol/PEG-DMG 60/7.5/31/1.5, lipid:siRNA ~6:1 LNP08 XTC XTC/DSPC/Cholesterol/PEG-DMG 60/7.5/31/1.5, lipid:siRNA ~11:1 LNP09 XTC XTC/DSPC/Cholesterol/PEG-DMG 50/10/38.5/1.5 Lipid:siRNA 10:1 LNP10 ALN100 ALN100/DSPC/Cholesterol/PEG-DMG 50/10/38.5/1.5 Lipid:siRNA 10:1 LNP11 MC3 MC-3/DSPC/Cholesterol/PEG-DMG 50/10/38.5/1.5 Lipid:siRNA 10:1 LNP12 C12-200 C12-200/DSPC/Cholesterol/PEG-DMG 50/10/38.5/1.5 Lipid:siRNA 10:1 LNP13 XTC XTC/DSPC/Chol/PEG-DMG 50/10/38.5/1.5 Lipid:siRNA: 33:1 LNP14 MC3 MC3/DSPC/Chol/PEG-DMG 40/15/40/5 Lipid:siRNA: 11:1 LNP15 MC3 MC3/DSPC/Chol/PEG-DSG/GalNAc-PEG-DSG 50/10/35/4.5/0.5 Lipid:siRNA: 11:1 LNP16 MC3 MC3/DSPC/Chol/PEG-DMG 50/10/38.5/1.5 Lipid:siRNA: 7:1 LNP17 MC3 MC3/DSPC/Chol/PEG-DSG 50/10/38.5/1.5 Lipid:siRNA: 10:1 LNP18 MC3 MC3/DSPC/Chol/PEG-DMG 50/10/38.5/1.5 Lipid:siRNA: 12:1 LNP19 MC3 MC3/DSPC/Chol/PEG-DMG 50/10/35/5 Lipid:siRNA: 8:1 LNP20 MC3 MC3/DSPC/Chol/PEG-DPG 50/10/38.5/1.5 Lipid:siRNA: 10:1 LNP21 C12-200 C12-200/DSPC/Chol/PEG-DSG 50/10/38.5/1.5 Lipid:siRNA: 7:1 LNP22 XTC XTC/DSPC/Chol/PEG-DSG 50/10/38.5/1.5 Lipid:siRNA: 10:1

SNALP (1,2-Dilinolenyloxy-N,N-dimethylaminopropane (DLinDMA)) comprising formulations are described in International Publication No. WO2009/127060, filed Apr. 15, 2009, which is hereby incorporated by reference.

XTC comprising formulations are described, e.g., in U.S. Provisional Ser. No. 61/148,366, filed Jan. 29, 2009; U.S. Provisional Ser. No. 61/156,851, filed Mar. 2, 2009; U.S. Provisional Serial No. filed Jun. 10, 2009; U.S. Provisional Ser. No. 61/228,373, filed Jul. 24, 2009; U.S. Provisional Ser. No. 61/239,686, filed Sep. 3, 2009, and International Application No. PCT/US2010/022614, filed Jan. 29, 2010, which are hereby incorporated by reference.

MC3 comprising formulations are described, e.g., in U.S. Provisional Ser. No. 61/244,834, filed Sep. 22, 2009, U.S. Provisional Ser. No. 61/185,800, filed Jun. 10, 2009, and International Application No. PCT/US10/28224, filed Jun. 10, 2010, which are hereby incorporated by reference.

ALNY-100 comprising formulations are described, e.g., International patent application number PCT/US09/63933, filed on Nov. 10, 2009, which is hereby incorporated by reference.

C12-200 comprising formulations are described in U.S. Provisional Ser. No. 61/175,770, filed May 5, 2009 and International Application No. PCT/US10/33777, filed May 5, 2010, which are hereby incorporated by reference.

Formulations prepared by either the standard or extrusion-free method can be characterized in similar manners. For example, formulations are typically characterized by visual inspection. They should be whitish translucent solutions free from aggregates or sediment. Particle size and particle size distribution of lipid-nanoparticles can be measured by light scattering using, for example, a Malvern Zetasizer Nano ZS (Malvern, USA). Particles should be about 20-300 nm, such as 40-100 nm in size. The particle size distribution should be unimodal. The total siRNA concentration in the formulation, as well as the entrapped fraction, is estimated using a dye exclusion assay. A sample of the formulated siRNA can be incubated with an RNA-binding dye, such as Ribogreen (Molecular Probes) in the presence or absence of a formulation disrupting surfactant, e.g., 0.5% Triton-X100. The total siRNA in the formulation can be determined by the signal from the sample containing the surfactant, relative to a standard curve. The entrapped fraction is determined by subtracting the “free” siRNA content (as measured by the signal in the absence of surfactant) from the total siRNA content. Percent entrapped siRNA is typically >85%. For SNALP formulation, the particle size is at least 30 nm, at least 40 nm, at least 50 nm, at least 60 nm, at least 70 nm, at least 80 nm, at least 90 nm, at least 100 nm, at least 110 nm, and at least 120 nm. The suitable range is typically about at least 50 nm to about at least 110 nm, about at least 60 nm to about at least 100 nm, or about at least 80 nm to about at least 90 nm.

Compositions and formulations for oral administration include powders or granules, microparticulates, nanoparticulates, suspensions or solutions in water or non-aqueous media, capsules, gel capsules, sachets, tablets or minitablets. Thickeners, flavoring agents, diluents, emulsifiers, dispersing aids or binders may be desirable. In some embodiments, oral formulations are those in which dsRNAs featured in the invention are administered in conjunction with one or more penetration enhancers surfactants and chelators. Suitable surfactants include fatty acids and/or esters or salts thereof, bile acids and/or salts thereof. Suitable bile acids/salts include chenodeoxycholic acid (CDCA) and ursodeoxychenodeoxycholic acid (UDCA), cholic acid, dehydrocholic acid, deoxycholic acid, glucholic acid, glycholic acid, glycodeoxycholic acid, taurocholic acid, taurodeoxycholic acid, sodium tauro-24,25-dihydro-fusidate and sodium glycodihydrofusidate. Suitable fatty acids include arachidonic acid, undecanoic acid, oleic acid, lauric acid, caprylic acid, capric acid, myristic acid, palmitic acid, stearic acid, linoleic acid, linolenic acid, dicaprate, tricaprate, monoolein, dilaurin, glyceryl 1-monocaprate, 1-dodecylazacycloheptan-2-one, an acylcarnitine, an acylcholine, or a monoglyceride, a diglyceride or a pharmaceutically acceptable salt thereof (e.g., sodium). In some embodiments, combinations of penetration enhancers are used, for example, fatty acids/salts in combination with bile acids/salts. One exemplary combination is the sodium salt of lauric acid, capric acid and UDCA. Further penetration enhancers include polyoxyethylene-9-lauryl ether, polyoxyethylene-20-cetyl ether. DsRNAs featured in the invention may be delivered orally, in granular form including sprayed dried particles, or complexed to form micro or nanoparticles. DsRNA complexing agents include poly-amino acids; polyimines; polyacrylates; polyalkylacrylates, polyoxethanes, polyalkylcyanoacrylates; cationized gelatins, albumins, starches, acrylates, polyethyleneglycols (PEG) and starches; polyalkylcyanoacrylates; DEAE-derivatized polyimines, pollulans, celluloses and starches. Suitable complexing agents include chitosan, N-trimethylchitosan, poly-Llysine, polyhistidine, polyornithine, polyspermines, protamine, polyvinylpyridine, polythiodiethylaminomethylethylene P(TDAE), polyaminostyrene (e.g., p-amino), poly(methylcyanoacrylate), poly(ethylcyanoacrylate), poly(butylcyanoacrylate), poly(isobutylcyanoacrylate), poly(isohexylcynaoacrylate), DEAE-methacrylate, DEAEhexylacrylate, DEAE-acrylamide, DEAE-albumin and DEAE-dextran, polymethylacrylate, polyhexylacrylate, poly(D,L-lactic acid), poly(DL-lactic-co-glycolic acid (PLGA), alginate, and polyethyleneglycol (PEG). Oral formulations for dsRNAs and their preparation are described in detail in U.S. Pat. No. 6,887,906, US Pub. No. 20030027780, and U.S. Pat. No. 6,747,014, each of which is incorporated herein by reference.

Compositions and formulations for parenteral, intraparenchymal (into the brain), intrathecal, intraventricular or intrahepatic administration may include sterile aqueous solutions which may also contain buffers, diluents and other suitable additives such as, but not limited to, penetration enhancers, carrier compounds and other pharmaceutically acceptable carriers or excipients.

Pharmaceutical compositions of the present invention include, but are not limited to, solutions, emulsions, and liposome-containing formulations. These compositions may be generated from a variety of components that include, but are not limited to, preformed liquids, self-emulsifying solids and self-emulsifying semisolids. Particularly preferred are formulations that target the liver when treating hepatic disorders such as hepatic carcinoma.

The pharmaceutical formulations of the present invention, which may conveniently be presented in unit dosage form, may be prepared according to conventional techniques well known in the pharmaceutical industry. Such techniques include the step of bringing into association the active ingredients with the pharmaceutical carrier(s) or excipient(s). In general, the formulations are prepared by uniformly and intimately bringing into association the active ingredients with liquid carriers or finely divided solid carriers or both, and then, if necessary, shaping the product.

The compositions of the present invention may be formulated into any of many possible dosage forms such as, but not limited to, tablets, capsules, gel capsules, liquid syrups, soft gels, suppositories, and enemas. The compositions of the present invention may also be formulated as suspensions in aqueous, non-aqueous or mixed media. Aqueous suspensions may further contain substances which increase the viscosity of the suspension including, for example, sodium carboxymethylcellulose, sorbitol and/or dextran. The suspension may also contain stabilizers.

Emulsions

The compositions of the present invention may be prepared and formulated as emulsions. Emulsions are typically heterogeneous systems of one liquid dispersed in another in the form of droplets usually exceeding 0.1 μm in diameter (Idson, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 199; Rosoff, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., Volume 1, p. 245; Block in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 2, p. 335; Higuchi et al., in Remington's Pharmaceutical Sciences, Mack Publishing Co., Easton, Pa., 1985, p. 301). Emulsions are often biphasic systems comprising two immiscible liquid phases intimately mixed and dispersed with each other. In general, emulsions may be of either the water-in-oil (w/o) or the oil-in-water (o/w) variety. When an aqueous phase is finely divided into and dispersed as minute droplets into a bulk oily phase, the resulting composition is called a water-in-oil (w/o) emulsion. Alternatively, when an oily phase is finely divided into and dispersed as minute droplets into a bulk aqueous phase, the resulting composition is called an oil-in-water (o/w) emulsion. Emulsions may contain additional components in addition to the dispersed phases, and the active drug which may be present as a solution in either the aqueous phase, oily phase or itself as a separate phase. Pharmaceutical excipients such as emulsifiers, stabilizers, dyes, and anti-oxidants may also be present in emulsions as needed. Pharmaceutical emulsions may also be multiple emulsions that are comprised of more than two phases such as, for example, in the case of oil-in-water-in-oil (o/w/o) and water-in-oil-in-water (w/o/w) emulsions. Such complex formulations often provide certain advantages that simple binary emulsions do not. Multiple emulsions in which individual oil droplets of an o/w emulsion enclose small water droplets constitute a w/o/w emulsion. Likewise a system of oil droplets enclosed in globules of water stabilized in an oily continuous phase provides an o/w/o emulsion.

Emulsions are characterized by little or no thermodynamic stability. Often, the dispersed or discontinuous phase of the emulsion is well dispersed into the external or continuous phase and maintained in this form through the means of emulsifiers or the viscosity of the formulation. Either of the phases of the emulsion may be a semisolid or a solid, as is the case of emulsion-style ointment bases and creams. Other means of stabilizing emulsions entail the use of emulsifiers that may be incorporated into either phase of the emulsion. Emulsifiers may broadly be classified into four categories: synthetic surfactants, naturally occurring emulsifiers, absorption bases, and finely dispersed solids (Idson, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 199).

Synthetic surfactants, also known as surface active agents, have found wide applicability in the formulation of emulsions and have been reviewed in the literature (Rieger, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 285; Idson, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), Marcel Dekker, Inc., New York, N.Y., 1988, volume 1, p. 199). Surfactants are typically amphiphilic and comprise a hydrophilic and a hydrophobic portion. The ratio of the hydrophilic to the hydrophobic nature of the surfactant has been termed the hydrophile/lipophile balance (HLB) and is a valuable tool in categorizing and selecting surfactants in the preparation of formulations. Surfactants may be classified into different classes based on the nature of the hydrophilic group: nonionic, anionic, cationic and amphoteric (Rieger, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 285).

Naturally occurring emulsifiers used in emulsion formulations include lanolin, beeswax, phosphatides, lecithin and acacia. Absorption bases possess hydrophilic properties such that they can soak up water to form w/o emulsions yet retain their semisolid consistencies, such as anhydrous lanolin and hydrophilic petrolatum. Finely divided solids have also been used as good emulsifiers especially in combination with surfactants and in viscous preparations. These include polar inorganic solids, such as heavy metal hydroxides, non-swelling clays such as bentonite, attapulgite, hectorite, kaolin, montmorillonite, colloidal aluminum silicate and colloidal magnesium aluminum silicate, pigments and nonpolar solids such as carbon or glyceryl tristearate.

A large variety of non-emulsifying materials are also included in emulsion formulations and contribute to the properties of emulsions. These include fats, oils, waxes, fatty acids, fatty alcohols, fatty esters, humectants, hydrophilic colloids, preservatives and antioxidants (Block, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 335; Idson, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 199).

Hydrophilic colloids or hydrocolloids include naturally occurring gums and synthetic polymers such as polysaccharides (for example, acacia, agar, alginic acid, carrageenan, guar gum, karaya gum, and tragacanth), cellulose derivatives (for example, carboxymethylcellulose and carboxypropylcellulose), and synthetic polymers (for example, carbomers, cellulose ethers, and carboxyvinyl polymers). These disperse or swell in water to form colloidal solutions that stabilize emulsions by forming strong interfacial films around the dispersed-phase droplets and by increasing the viscosity of the external phase.

Since emulsions often contain a number of ingredients such as carbohydrates, proteins, sterols and phosphatides that may readily support the growth of microbes, these formulations often incorporate preservatives. Commonly used preservatives included in emulsion formulations include methyl paraben, propyl paraben, quaternary ammonium salts, benzalkonium chloride, esters of p-hydroxybenzoic acid, and boric acid. Antioxidants are also commonly added to emulsion formulations to prevent deterioration of the formulation. Antioxidants used may be free radical scavengers such as tocopherols, alkyl gallates, butylated hydroxyanisole, butylated hydroxytoluene, or reducing agents such as ascorbic acid and sodium metabisulfite, and antioxidant synergists such as citric acid, tartaric acid, and lecithin.

The application of emulsion formulations via dermatological, oral and parenteral routes and methods for their manufacture have been reviewed in the literature (Idson, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 199). Emulsion formulations for oral delivery have been very widely used because of ease of formulation, as well as efficacy from an absorption and bioavailability standpoint (Rosoff, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 245; Idson, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 199). Mineral-oil base laxatives, oil-soluble vitamins and high fat nutritive preparations are among the materials that have commonly been administered orally as o/w emulsions.

In one embodiment of the present invention, the compositions of dsRNAs and nucleic acids are formulated as microemulsions. A microemulsion may be defined as a system of water, oil and amphiphile which is a single optically isotropic and thermodynamically stable liquid solution (Rosoff, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 245). Typically microemulsions are systems that are prepared by first dispersing an oil in an aqueous surfactant solution and then adding a sufficient amount of a fourth component, generally an intermediate chain-length alcohol to form a transparent system. Therefore, microemulsions have also been described as thermodynamically stable, isotropically clear dispersions of two immiscible liquids that are stabilized by interfacial films of surface-active molecules (Leung and Shah, in: Controlled Release of Drugs: Polymers and Aggregate Systems, Rosoff, M., Ed., 1989, VCH Publishers, New York, pages 185-215). Microemulsions commonly are prepared via a combination of three to five components that include oil, water, surfactant, cosurfactant and electrolyte. Whether the microemulsion is of the water-in-oil (w/o) or an oil-in-water (o/w) type is dependent on the properties of the oil and surfactant used and on the structure and geometric packing of the polar heads and hydrocarbon tails of the surfactant molecules (Schott, in Remington's Pharmaceutical Sciences, Mack Publishing Co., Easton, Pa., 1985, p. 271).

The phenomenological approach utilizing phase diagrams has been extensively studied and has yielded a comprehensive knowledge, to one skilled in the art, of how to formulate microemulsions (Rosoff, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 245; Block, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 335). Compared to conventional emulsions, microemulsions offer the advantage of solubilizing water-insoluble drugs in a formulation of thermodynamically stable droplets that are formed spontaneously.

Surfactants used in the preparation of microemulsions include, but are not limited to, ionic surfactants, non-ionic surfactants, Brij 96, polyoxyethylene oleyl ethers, polyglycerol fatty acid esters, tetraglycerol monolaurate (ML310), tetraglycerol monooleate (MO310), hexaglycerol monooleate (PO310), hexaglycerol pentaoleate (PO500), decaglycerol monocaprate (MCA750), decaglycerol monooleate (MO750), decaglycerol sequioleate (SO750), decaglycerol decaoleate (DAO750), alone or in combination with cosurfactants. The cosurfactant, usually a short-chain alcohol such as ethanol, 1-propanol, and 1-butanol, serves to increase the interfacial fluidity by penetrating into the surfactant film and consequently creating a disordered film because of the void space generated among surfactant molecules. Microemulsions may, however, be prepared without the use of cosurfactants and alcohol-free self-emulsifying microemulsion systems are known in the art. The aqueous phase may typically be, but is not limited to, water, an aqueous solution of the drug, glycerol, PEG300, PEG400, polyglycerols, propylene glycols, and derivatives of ethylene glycol. The oil phase may include, but is not limited to, materials such as Captex 300, Captex 355, Capmul MCM, fatty acid esters, medium chain (C8-C12) mono, di, and tri-glycerides, polyoxyethylated glyceryl fatty acid esters, fatty alcohols, polyglycolized glycerides, saturated polyglycolized C8-C10 glycerides, vegetable oils and silicone oil.

Microemulsions are particularly of interest from the standpoint of drug solubilization and the enhanced absorption of drugs. Lipid based microemulsions (both o/w and w/o) have been proposed to enhance the oral bioavailability of drugs, including peptides (Constantinides et al., Pharmaceutical Research, 1994, 11, 1385-1390; Ritschel, Meth. Find. Exp. Clin. Pharmacol., 1993, 13, 205). Microemulsions afford advantages of improved drug solubilization, protection of drug from enzymatic hydrolysis, possible enhancement of drug absorption due to surfactant-induced alterations in membrane fluidity and permeability, ease of preparation, ease of oral administration over solid dosage forms, improved clinical potency, and decreased toxicity (Constantinides et al., Pharmaceutical Research, 1994, 11, 1385; Ho et al., J. Pharm. Sci., 1996, 85, 138-143). Often microemulsions may form spontaneously when their components are brought together at ambient temperature. This may be particularly advantageous when formulating thermolabile drugs, peptides or dsRNAs. Microemulsions have also been effective in the transdermal delivery of active components in both cosmetic and pharmaceutical applications. It is expected that the microemulsion compositions and formulations of the present invention will facilitate the increased systemic absorption of dsRNAs and nucleic acids from the gastrointestinal tract, as well as improve the local cellular uptake of dsRNAs and nucleic acids.

Microemulsions of the present invention may also contain additional components and additives such as sorbitan monostearate (Grill 3), Labrasol, and penetration enhancers to improve the properties of the formulation and to enhance the absorption of the dsRNAs and nucleic acids of the present invention. Penetration enhancers used in the microemulsions of the present invention may be classified as belonging to one of five broad categories—surfactants, fatty acids, bile salts, chelating agents, and non-chelating non-surfactants (Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, p. 92). Each of these classes has been discussed above.

Penetration Enhancers

In one embodiment, the present invention employs various penetration enhancers to effect the efficient delivery of nucleic acids, particularly dsRNAs, to the skin of animals. Most drugs are present in solution in both ionized and nonionized forms. However, usually only lipid soluble or lipophilic drugs readily cross cell membranes. It has been discovered that even non-lipophilic drugs may cross cell membranes if the membrane to be crossed is treated with a penetration enhancer. In addition to aiding the diffusion of non-lipophilic drugs across cell membranes, penetration enhancers also enhance the permeability of lipophilic drugs.

Penetration enhancers may be classified as belonging to one of five broad categories, i.e., surfactants, fatty acids, bile salts, chelating agents, and non-chelating non-surfactants (Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, p. 92). Each of the above mentioned classes of penetration enhancers are described below in greater detail.

Surfactants: In connection with the present invention, surfactants (or “surface-active agents”) are chemical entities which, when dissolved in an aqueous solution, reduce the surface tension of the solution or the interfacial tension between the aqueous solution and another liquid, with the result that absorption of dsRNAs through the mucosa is enhanced. In addition to bile salts and fatty acids, these penetration enhancers include, for example, sodium lauryl sulfate, polyoxyethylene-9-lauryl ether and polyoxyethylene-20-cetyl ether) (Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, p. 92); and perfluorochemical emulsions, such as FC-43. Takahashi et al., J. Pharm. Pharmacol., 1988, 40, 252).

Fatty acids: Various fatty acids and their derivatives which act as penetration enhancers include, for example, oleic acid, lauric acid, capric acid (n-decanoic acid), myristic acid, palmitic acid, stearic acid, linoleic acid, linolenic acid, dicaprate, tricaprate, monoolein (1-monooleoyl-rac-glycerol), dilaurin, caprylic acid, arachidonic acid, glycerol 1-monocaprate, 1-dodecylazacycloheptan-2-one, acylcarnitines, acylcholines, C.sub.1-10 alkyl esters thereof (e.g., methyl, isopropyl and t-butyl), and mono- and di-glycerides thereof (i.e., oleate, laurate, caprate, myristate, palmitate, stearate, linoleate, etc.) (Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, p. 92; Muranishi, Critical Reviews in Therapeutic Drug Carrier Systems, 1990, 7, 1-33; El Hariri et al., J. Pharm. Pharmacol., 1992, 44, 651-654).

Bile salts: The physiological role of bile includes the facilitation of dispersion and absorption of lipids and fat-soluble vitamins (Brunton, Chapter 38 in: Goodman & Gilman's The Pharmacological Basis of Therapeutics, 9th Ed., Hardman et al. Eds., McGraw-Hill, New York, 1996, pp. 934-935). Various natural bile salts, and their synthetic derivatives, act as penetration enhancers. Thus the term “bile salts” includes any of the naturally occurring components of bile as well as any of their synthetic derivatives. Suitable bile salts include, for example, cholic acid (or its pharmaceutically acceptable sodium salt, sodium cholate), dehydrocholic acid (sodium dehydrocholate), deoxycholic acid (sodium deoxycholate), glucholic acid (sodium glucholate), glycholic acid (sodium glycocholate), glycodeoxycholic acid (sodium glycodeoxycholate), taurocholic acid (sodium taurocholate), taurodeoxycholic acid (sodium taurodeoxycholate), chenodeoxycholic acid (sodium chenodeoxycholate), ursodeoxycholic acid (UDCA), sodium tauro-24,25-dihydro-fusidate (STDHF), sodium glycodihydrofusidate and polyoxyethylene-9-lauryl ether (POE) (Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, page 92; Swinyard, Chapter 39 In: Remington's Pharmaceutical Sciences, 18th Ed., Gennaro, ed., Mack Publishing Co., Easton, Pa., 1990, pages 782-783; Muranishi, Critical Reviews in Therapeutic Drug Carrier Systems, 1990, 7, 1-33; Yamamoto et al., J. Pharm. Exp. Ther., 1992, 263, 25; Yamashita et al., J. Pharm. Sci., 1990, 79, 579-583).

Chelating Agents: Chelating agents, as used in connection with the present invention, can be defined as compounds that remove metallic ions from solution by forming complexes therewith, with the result that absorption of dsRNAs through the mucosa is enhanced. With regards to their use as penetration enhancers in the present invention, chelating agents have the added advantage of also serving as DNase inhibitors, as most characterized DNA nucleases require a divalent metal ion for catalysis and are thus inhibited by chelating agents (Jarrett, J. Chromatogr., 1993, 618, 315-339). Suitable chelating agents include but are not limited to disodium ethylenediaminetetraacetate (EDTA), citric acid, salicylates (e.g., sodium salicylate, 5-methoxysalicylate and homovanilate), N-acyl derivatives of collagen, laureth-9 and N-amino acyl derivatives of beta-diketones (enamines)(Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, page 92; Muranishi, Critical Reviews in Therapeutic Drug Carrier Systems, 1990, 7, 1-33; Buur et al., J. Control Rel., 1990, 14, 43-51).

Non-chelating non-surfactants: As used herein, non-chelating non-surfactant penetration enhancing compounds can be defined as compounds that demonstrate insignificant activity as chelating agents or as surfactants but that nonetheless enhance absorption of dsRNAs through the alimentary mucosa (Muranishi, Critical Reviews in Therapeutic Drug Carrier Systems, 1990, 7, 1-33). This class of penetration enhancers include, for example, unsaturated cyclic ureas, 1-alkyl- and 1-alkenylazacyclo-alkanone derivatives (Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, page 92); and non-steroidal anti-inflammatory agents such as diclofenac sodium, indomethacin and phenylbutazone (Yamashita et al., J. Pharm. Pharmacol., 1987, 39, 621-626).

Carriers

Certain compositions of the present invention also incorporate carrier compounds in the formulation. As used herein, “carrier compound” or “carrier” can refer to a nucleic acid, or analog thereof, which is inert (i.e., does not possess biological activity per se) but is recognized as a nucleic acid by in vivo processes that reduce the bioavailability of a nucleic acid having biological activity by, for example, degrading the biologically active nucleic acid or promoting its removal from circulation. The coadministration of a nucleic acid and a carrier compound, typically with an excess of the latter substance, can result in a substantial reduction of the amount of nucleic acid recovered in the liver, kidney or other extracirculatory reservoirs, presumably due to competition between the carrier compound and the nucleic acid for a common receptor. For example, the recovery of a partially phosphorothioate dsRNA in hepatic tissue can be reduced when it is co-administered with polyinosinic acid, dextran sulfate, polycytidic acid or 4-acetamido-4′ isothiocyano-stilbene-2,2′-disulfonic acid (Miyao et al., DsRNA Res. Dev., 1995, 5, 115-121; Takakura et al., DsRNA & Nucl. Acid Drug Dev., 1996, 6, 177-183.

Excipients

In contrast to a carrier compound, a “pharmaceutical carrier” or “excipient” is a pharmaceutically acceptable solvent, suspending agent or any other pharmacologically inert vehicle for delivering one or more nucleic acids to an animal. The excipient may be liquid or solid and is selected, with the planned manner of administration in mind, so as to provide for the desired bulk, consistency, etc., when combined with a nucleic acid and the other components of a given pharmaceutical composition. Typical pharmaceutical carriers include, but are not limited to, binding agents (e.g., pre-gelatinized maize starch, polyvinylpyrrolidone or hydroxypropyl methylcellulose, etc.); fillers (e.g., lactose and other sugars, microcrystalline cellulose, pectin, gelatin, calcium sulfate, ethyl cellulose, polyacrylates or calcium hydrogen phosphate, etc.); lubricants (e.g., magnesium stearate, talc, silica, colloidal silicon dioxide, stearic acid, metallic stearates, hydrogenated vegetable oils, corn starch, polyethylene glycols, sodium benzoate, sodium acetate, etc.); disintegrants (e.g., starch, sodium starch glycolate, etc.); and wetting agents (e.g., sodium lauryl sulphate, etc).

Pharmaceutically acceptable organic or inorganic excipients suitable for non-parenteral administration which do not deleteriously react with nucleic acids can also be used to formulate the compositions of the present invention. Suitable pharmaceutically acceptable carriers include, but are not limited to, water, salt solutions, alcohols, polyethylene glycols, gelatin, lactose, amylose, magnesium stearate, talc, silicic acid, viscous paraffin, hydroxymethylcellulose, polyvinylpyrrolidone and the like.

Formulations for topical administration of nucleic acids may include sterile and non-sterile aqueous solutions, non-aqueous solutions in common solvents such as alcohols, or solutions of the nucleic acids in liquid or solid oil bases. The solutions may also contain buffers, diluents and other suitable additives. Pharmaceutically acceptable organic or inorganic excipients suitable for non-parenteral administration which do not deleteriously react with nucleic acids can be used.

Suitable pharmaceutically acceptable excipients include, but are not limited to, water, salt solutions, alcohol, polyethylene glycols, gelatin, lactose, amylose, magnesium stearate, talc, silicic acid, viscous paraffin, hydroxymethylcellulose, polyvinylpyrrolidone and the like.

Other Components

The compositions of the present invention may additionally contain other adjunct components conventionally found in pharmaceutical compositions, at their art-established usage levels. Thus, for example, the compositions may contain additional, compatible, pharmaceutically-active materials such as, for example, antipruritics, astringents, local anesthetics or anti-inflammatory agents, or may contain additional materials useful in physically formulating various dosage forms of the compositions of the present invention, such as dyes, flavoring agents, preservatives, antioxidants, opacifiers, thickening agents and stabilizers. However, such materials, when added, should not unduly interfere with the biological activities of the components of the compositions of the present invention. The formulations can be sterilized and, if desired, mixed with auxiliary agents, e.g., lubricants, preservatives, stabilizers, wetting agents, emulsifiers, salts for influencing osmotic pressure, buffers, colorings, flavorings and/or aromatic substances and the like which do not deleteriously interact with the nucleic acid(s) of the formulation.

Aqueous suspensions may contain substances which increase the viscosity of the suspension including, for example, sodium carboxymethylcellulose, sorbitol and/or dextran. The suspension may also contain stabilizers.

In some embodiments, pharmaceutical compositions featured in the invention include (a) one or more dsRNA compounds and (b) one or more anti-cytokine biologic agents which function by a non-RNAi mechanism. Examples of such biologics include, biologics that target IL1β (e.g., anakinra), IL6 (tocilizumab), or TNF (etanercept, infliximab, adlimumab, or certolizumab).

Toxicity and therapeutic efficacy of such compounds can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., for determining the LD50 (the dose lethal to 50% of the population) and the ED50 (the dose therapeutically effective in 50% of the population). The dose ratio between toxic and therapeutic effects is the therapeutic index and it can be expressed as the ratio LD50/ED50. Compounds that exhibit high therapeutic indices are preferred.

The data obtained from cell culture assays and animal studies can be used in formulating a range of dosage for use in humans. The dosage of compositions featured in the invention lies generally within a range of circulating concentrations that include the ED50 with little or no toxicity. The dosage may vary within this range depending upon the dosage form employed and the route of administration utilized. For any compound used in the methods featured in the invention, the therapeutically effective dose can be estimated initially from cell culture assays. A dose may be formulated in animal models to achieve a circulating plasma concentration range of the compound or, when appropriate, of the polypeptide product of a target sequence (e.g., achieving a decreased concentration of the polypeptide) that includes the IC50 (i.e., the concentration of the test compound which achieves a half-maximal inhibition of symptoms) as determined in cell culture. Such information can be used to more accurately determine useful doses in humans. Levels in plasma may be measured, for example, by high performance liquid chromatography.

In addition to their administration, as discussed above, the dsRNAs featured in the invention can be administered in combination with other known agents effective in treatment of pathological processes mediated by PROC expression. In any event, the administering physician can adjust the amount and timing of dsRNA administration on the basis of results observed using standard measures of efficacy known in the art or described herein.

Methods for Inhibiting Expression of a PROC Gene

In yet another aspect, the invention provides a method for inhibiting the expression of a PROC gene in a cell. The method includes administering a dsRNA targeting a PROC gene such that expression of the target PROC gene is reduced. The invention includes methods performed in vitro or in vivo. In some embodiments, the method is performed in an animal, e.g., a mouse, a rat, a non-human primate, or a human.

The present invention also provides methods of using a dsRNA of the invention and/or a composition containing an iRNA of the invention to reduce and/or inhibit PROC expression in a cell. The methods include contacting the cell with a dsRNA of the invention and maintaining the cell for a time sufficient to obtain degradation of the mRNA transcript of a PROC gene, thereby inhibiting expression of the PROC gene in the cell. Reduction in gene expression can be assessed by any methods known in the art. For example, a reduction in the expression of PROC may be determined by determining the mRNA expression level of PROC using methods routine to one of ordinary skill in the art, e.g., Northern blotting, qRT-PCR, by determining the protein level of PROC using methods routine to one of ordinary skill in the art, such as Western blotting, immunological techniques, and/or by determining a biological activity of PROC, such as affecting one or more molecules associated with the cellular blood clotting mechanism (or in an in vivo setting, blood clotting itself).

In the methods of the invention the cell may be contacted in vitro or in vivo, i.e., the cell may be within a subject.

A cell suitable for treatment using the methods of the invention may be any cell that expresses a PROC gene. A cell suitable for use in the methods of the invention may be a mammalian cell, e.g., a primate cell (such as a human cell or a non-human primate cell, e.g., a monkey cell or a chimpanzee cell), a non-primate cell (such as a cow cell, a pig cell, a camel cell, a llama cell, a horse cell, a goat cell, a rabbit cell, a sheep cell, a hamster, a guinea pig cell, a cat cell, a dog cell, a rat cell, a mouse cell, a lion cell, a tiger cell, a bear cell, or a buffalo cell), a bird cell (e.g., a duck cell or a goose cell), or a whale cell. In one embodiment, the cell is a human cell, e.g., a human liver cell.

PROC expression is inhibited in the cell by at least about 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, or about 100%.

The in vivo methods of the invention may include administering to a subject a composition containing an dsRNA, where the dsRNA includes a nucleotide sequence that is complementary to at least a part of an RNA transcript of the PROC gene of the mammal to be treated. When the organism to be treated is a mammal such as a human, the composition can be administered by any means known in the art including, but not limited to oral, intraperitoneal, or parenteral routes, including intracranial (e.g., intraventricular, intraparenchymal and intrathecal), intravenous, intramuscular, subcutaneous, transdermal, airway (aerosol), nasal, rectal, and topical (including buccal and sublingual) administration. In certain embodiments, the compositions are administered by intravenous infusion or injection or subcutaneous injection.

In some embodiments, the administration is via a depot injection. A depot injection may release the dsRNA in a consistent way over a prolonged time period. Thus, a depot injection may reduce the frequency of dosing needed to obtain a desired effect, e.g., a desired inhibition of PROC, or a therapeutic or prophylactic effect. A depot injection may also provide more consistent serum concentrations. Depot injections may include subcutaneous injections or intramuscular injections. In preferred embodiments, the depot injection is a subcutaneous injection.

In some embodiments, the administration is via a pump. The pump may be an external pump or a surgically implanted pump. In certain embodiments, the pump is a subcutaneously implanted osmotic pump. In other embodiments, the pump is an infusion pump. An infusion pump may be used for intravenous, subcutaneous, arterial, or epidural infusions. In preferred embodiments, the infusion pump is a subcutaneous infusion pump. In other embodiments, the pump is a surgically implanted pump that delivers the dsRNA to the liver.

The mode of administration may be chosen based upon whether local or systemic treatment is desired and based upon the area to be treated. The route and site of administration may be chosen to enhance targeting.

In one aspect, the present invention also provides methods for inhibiting the expression of a PROCgene in a mammal. The methods include administering to the mammal a composition comprising a dsRNA that targets a PROC gene in a cell of the mammal and maintaining the mammal for a time sufficient to obtain degradation of the mRNA transcript of the PROC gene, thereby inhibiting expression of the PROC gene in the cell. Reduction in gene expression can be assessed by any methods known it the art and by methods, e.g. qRT-PCR, described herein. Reduction in protein production can be assessed by any methods known it the art and by methods, e.g. ELISA, described herein. In one embodiment, a puncture liver biopsy sample serves as the tissue material for monitoring the reduction in PROC gene and/or protein expression. In other embodiments, inhibition of the expression of a PROC gene is monitored indirectly by, for example, determining the expression and/or activity of a gene in a PROC pathway. For example, the activity of factor Xa may be monitored to determine the inhibition of expression of a PROC gene. Antithrombin levels in a sample, e.g., a blood or liver sample, may also be measured. Suitable assays are further described in the Examples section below.

The present invention further provides methods of treatment of a subject in need thereof The treatment methods of the invention include administering an dsRNA of the invention to a subject, e.g., a subject that would benefit from a reduction and/or inhibition of PROC expression in a therapeutically effective amount of an dsRNA targeting a PROC gene or a pharmaceutical composition comprising an dsRNA targeting a PROC gene.

An dsRNA of the invention may be administered in “naked” form, or as a “free dsRNA.” A naked dsRNA is administered in the absence of a pharmaceutical composition. The naked dsRNA may be in a suitable buffer solution. The buffer solution may comprise acetate, citrate, prolamine, carbonate, or phosphate, or any combination thereof. In one embodiment, the buffer solution is phosphate buffered saline (PBS). The pH and osmolarity of the buffer solution containing the dsRNA can be adjusted such that it is suitable for administering to a subject.

Alternatively, a dsRNA of the invention may be administered as a pharmaceutical composition, such as a dsRNA liposomal formulation.

Subjects that would benefit from a reduction and/or inhibition of PROCgene expression are those having a bleeding disorder, e.g., an inherited bleeding disorder or an acquired bleeding disorder. In one embodiment, a subject having an inherited bleeding disorder has a hemophilia, e.g., hemophilia A, B, or C. In one embodiment, a subject having an inherited bleeding disorder, e.g., a hemophilia, is an inhibitor subject. In one embodiment, the inhibitor subject has hemophilia A. In another embodiment, the inhibitor subject has hemophilia B. In yet another embodiment, the inhibitor subject has hemophilia C. Treatment of a subject that would benefit from a reduction and/or inhibition of PROC gene expression includes therapeutic (e.g., on-demand, e.g., the subject is bleeding (spontaneous bleeding or bleeding as a result of trauma) and failing to clot) and prophylactic (e.g., the subject is not bleeding and/or is to undergo surgery) treatment.

The invention further provides methods for the use of an dsRNA or a pharmaceutical composition thereof, e.g., for treating a subject that would benefit from reduction and/or inhibition of PROC expression, e.g., a subject having a bleeding disorder, in combination with other pharmaceuticals and/or other therapeutic methods, e.g., with known pharmaceuticals and/or known therapeutic methods, such as, for example, those which are currently employed for treating these disorders. For example, in certain embodiments, an dsRNA targeting PROC is administered in combination with, e.g., an agent useful in treating a bleeding disorder as described elsewhere herein. For example, additional therapeutics and therapeutic methods suitable for treating a subject that would benefit from reduction in PROC expression, e.g., a subject having a bleeding disorder, include fresh-frozen plasma (FFP); recombinant FVIIa; recombinant FIX; FXI concentrates; virus-inactivated, vWF-containing FVIII concentrates; desensitization therapy which may include large doses of FVIII or FIX, along with steroids or intravenous immunoglobulin (IVIG) and cyclophosphamide; plasmapheresis in conjunction with immunosuppression and infusion of FVIII or FIX, with or without antifibrinolytic therapy; immune tolerance induction (ITI), with or without immunosuppressive therapy (e.g., cyclophosphamide, prednisone, and/or anti-CD20); desmopressin acetate [DDAVP]; antifibrinolytics, such as aminocaproic acid and tranexamic acid; activated prothrombin complex concentrate (PCC); antihemophilic agents; corticosteroids; immunosuppressive agents; and estrogens. The dsRNA and an additional therapeutic agent and/or treatment may be administered at the same time and/or in the same combination, e.g., parenterally, or the additional therapeutic agent can be administered as part of a separate composition or at separate times and/or by another method known in the art or described herein.

In one embodiment, the method includes administering a composition featured herein such that expression of the target PROC gene is decreased, such as for about 1, 2, 3, 4, 5, 6, 7, 8, 12, 16, 18, 24 hours, 28, 32, or about 36 hours. In one embodiment, expression of the target PROC gene is decreased for an extended duration, e.g., at least about two, three, four days or more, e.g., about one week, two weeks, three weeks, or four weeks or longer.

Preferably, the iRNAs useful for the methods and compositions featured herein specifically target RNAs (primary or processed) of the target PROCgene. Compositions and methods for inhibiting the expression of these genes using iRNAs can be prepared and performed as described herein.

Administration of the dsRNA according to the methods of the invention may result in a reduction of the severity, signs, symptoms, and/or markers of such diseases or disorders in a patient with a bleeding disorder. By “reduction” in this context is meant a statistically significant decrease in such level. The reduction can be, for example, at least about 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or about 100%.

Efficacy of treatment or prevention of disease can be assessed, for example by measuring disease progression, disease remission, symptom severity, frequency of bleeds, reduction in pain, quality of life, dose of a medication required to sustain a treatment effect, level of a disease marker or any other measurable parameter appropriate for a given disease being treated or targeted for prevention. It is well within the ability of one skilled in the art to monitor efficacy of treatment or prevention by measuring any one of such parameters, or any combination of parameters. For example, efficacy of treatment of a bleeding disorder may be assessed, for example, by periodic monitoring of thrombin:anti-thrombin levels. Comparisons of the later readings with the initial readings provide a physician an indication of whether the treatment is effective. It is well within the ability of one skilled in the art to monitor efficacy of treatment or prevention by measuring any one of such parameters, or any combination of parameters. In connection with the administration of an dsRNA targeting PROC or pharmaceutical composition thereof, “effective against” a bleeding disorder indicates that administration in a clinically appropriate manner results in a beneficial effect for at least a statistically significant fraction of patients, such as a improvement of symptoms, a cure, a reduction in disease, extension of life, improvement in quality of life, or other effect generally recognized as positive by medical doctors familiar with treating bleeding disorders and the related causes.

A treatment or preventive effect is evident when there is a statistically significant improvement in one or more parameters of disease status, or by a failure to worsen or to develop symptoms where they would otherwise be anticipated. As an example, a favorable change of at least 10% in a measurable parameter of disease, and preferably at least 20%, 30%, 40%, 50% or more can be indicative of effective treatment. Efficacy for a given dsRNA drug or formulation of that drug can also be judged using an experimental animal model for the given disease as known in the art. When using an experimental animal model, efficacy of treatment is evidenced when a statistically significant reduction in a marker or symptom is observed.

Alternatively, the efficacy can be measured by a reduction in the severity of disease as determined by one skilled in the art of diagnosis based on a clinically accepted disease severity grading scale, as but one example the Child-Pugh score (sometimes the Child-Turcotte-Pugh score). Any positive change resulting in e.g., lessening of severity of disease measured using the appropriate scale, represents adequate treatment using an dsRNA or dsRNA formulation as described herein.

Subjects can be administered a therapeutic amount of dsRNA, such as about 0.01 mg/kg, 0.02 mg/kg, 0.03 mg/kg, 0.04 mg/kg, 0.05 mg/kg, 0.1 mg/kg, 0.15 mg/kg, 0.2 mg/kg, 0.25 mg/kg, 0.3 mg/kg, 0.35 mg/kg, 0.4 mg/kg, 0.45 mg/kg, 0.5 mg/kg, 0.55 mg/kg, 0.6 mg/kg, 0.65 mg/kg, 0.7 mg/kg, 0.75 mg/kg, 0.8 mg/kg, 0.85 mg/kg, 0.9 mg/kg, 0.95 mg/kg, 1.0 mg/kg, 1.1 mg/kg, 1.2 mg/kg, 1.3 mg/kg, 1.4 mg/kg, 1.5 mg/kg, 1.6 mg/kg, 1.7 mg/kg, 1.8 mg/kg, 1.9 mg/kg, 2.0 mg/kg, 2.1 mg/kg, 2.2 mg/kg, 2.3 mg/kg, 2.4 mg/kg, 2.5 mg/kg dsRNA, 2.6 mg/kg dsRNA, 2.7 mg/kg dsRNA, 2.8 mg/kg dsRNA, 2.9 mg/kg dsRNA, 3.0 mg/kg dsRNA, 3.1 mg/kg dsRNA, 3.2 mg/kg dsRNA, 3.3 mg/kg dsRNA, 3.4 mg/kg dsRNA, 3.5 mg/kg dsRNA, 3.6 mg/kg dsRNA, 3.7 mg/kg dsRNA, 3.8 mg/kg dsRNA, 3.9 mg/kg dsRNA, 4.0 mg/kg dsRNA, 4.1 mg/kg dsRNA, 4.2 mg/kg dsRNA, 4.3 mg/kg dsRNA, 4.4 mg/kg dsRNA, 4.5 mg/kg dsRNA, 4.6 mg/kg dsRNA, 4.7 mg/kg dsRNA, 4.8 mg/kg dsRNA, 4.9 mg/kg dsRNA, 5.0 mg/kg dsRNA, 5.1 mg/kg dsRNA, 5.2 mg/kg dsRNA, 5.3 mg/kg dsRNA, 5.4 mg/kg dsRNA, 5.5 mg/kg dsRNA, 5.6 mg/kg dsRNA, 5.7 mg/kg dsRNA, 5.8 mg/kg dsRNA, 5.9 mg/kg dsRNA, 6.0 mg/kg dsRNA, 6.1 mg/kg dsRNA, 6.2 mg/kg dsRNA, 6.3 mg/kg dsRNA, 6.4 mg/kg dsRNA, 6.5 mg/kg dsRNA, 6.6 mg/kg dsRNA, 6.7 mg/kg dsRNA, 6.8 mg/kg dsRNA, 6.9 mg/kg dsRNA, 7.0 mg/kg dsRNA, 7.1 mg/kg dsRNA, 7.2 mg/kg dsRNA, 7.3 mg/kg dsRNA, 7.4 mg/kg dsRNA, 7.5 mg/kg dsRNA, 7.6 mg/kg dsRNA, 7.7 mg/kg dsRNA, 7.8 mg/kg dsRNA, 7.9 mg/kg dsRNA, 8.0 mg/kg dsRNA, 8.1 mg/kg dsRNA, 8.2 mg/kg dsRNA, 8.3 mg/kg dsRNA, 8.4 mg/kg dsRNA, 8.5 mg/kg dsRNA, 8.6 mg/kg dsRNA, 8.7 mg/kg dsRNA, 8.8 mg/kg dsRNA, 8.9 mg/kg dsRNA, 9.0 mg/kg dsRNA, 9.1 mg/kg dsRNA, 9.2 mg/kg dsRNA, 9.3 mg/kg dsRNA, 9.4 mg/kg dsRNA, 9.5 mg/kg dsRNA, 9.6 mg/kg dsRNA, 9.7 mg/kg dsRNA, 9.8 mg/kg dsRNA, 9.9 mg/kg dsRNA, 9.0 mg/kg dsRNA, 10 mg/kg dsRNA, 15 mg/kg dsRNA, 20 mg/kg dsRNA, 25 mg/kg dsRNA, 30 mg/kg dsRNA, 35 mg/kg dsRNA, 40 mg/kg dsRNA, 45 mg/kg dsRNA, or about 50 mg/kg dsRNA. Values and ranges intermediate to the recited values are also intended to be part of this invention.

In certain embodiments, for example, when a composition of the invention comprises a dsRNA as described herein and a lipid, subjects can be administered a therapeutic amount of dsRNA, such as about 0.01 mg/kg to about 5 mg/kg, about 0.01 mg/kg to about 10 mg/kg, about 0.05 mg/kg to about 5 mg/kg, about 0.05 mg/kg to about 10 mg/kg, about 0.1 mg/kg to about 5 mg/kg, about 0.1 mg/kg to about 10 mg/kg, about 0.2 mg/kg to about 5 mg/kg, about 0.2 mg/kg to about 10 mg/kg, about 0.3 mg/kg to about 5 mg/kg, about 0.3 mg/kg to about 10 mg/kg, about 0.4 mg/kg to about 5 mg/kg, about 0.4 mg/kg to about 10 mg/kg, about 0.5 mg/kg to about 5 mg/kg, about 0.5 mg/kg to about 10 mg/kg, about 1 mg/kg to about 5 mg/kg, about 1 mg/kg to about 10 mg/kg, about 1.5 mg/kg to about 5 mg/kg, about 1.5 mg/kg to about 10 mg/kg, about 2 mg/kg to about 2.5 mg/kg, about 2 mg/kg to about 10 mg/kg, about 3 mg/kg to about 5 mg/kg, about 3 mg/kg to about 10 mg/kg, about 3.5 mg/kg to about 5 mg/kg, about 4 mg/kg to about 5 mg/kg, about 4.5 mg/kg to about 5 mg/kg, about 4 mg/kg to about 10 mg/kg, about 4.5 mg/kg to about 10 mg/kg, about 5 mg/kg to about 10 mg/kg, about 5.5 mg/kg to about 10 mg/kg, about 6 mg/kg to about 10 mg/kg, about 6.5 mg/kg to about 10 mg/kg, about 7 mg/kg to about 10 mg/kg, about 7.5 mg/kg to about 10 mg/kg, about 8 mg/kg to about 10 mg/kg, about 8.5 mg/kg to about 10 mg/kg, about 9 mg/kg to about 10 mg/kg, or about 9.5 mg/kg to about 10 mg/kg. Values and ranges intermediate to the recited values are also intended to be part of this invention.

For example, the dsRNA may be administered at a dose of about 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9, 9.1, 9.2, 9.3, 9.4, 9.5, 9.6, 9.7, 9.8, 9.9, or about 10 mg/kg. Values and ranges intermediate to the recited values are also intended to be part of this invention.

In other embodiments, for example, when a composition of the invention comprises a dsRNA as described herein and an N-acetylgalactosamine, subjects can be administered a therapeutic amount of dsRNA, such as a dose of about 0.1 to about 50 mg/kg, about 0.25 to about 50 mg/kg, about 0.5 to about 50 mg/kg, about 0.75 to about 50 mg/kg, about 1 to about 50 mg/mg, about 1.5 to about 50 mg/kb, about 2 to about 50 mg/kg, about 2.5 to about 50 mg/kg, about 3 to about 50 mg/kg, about 3.5 to about 50 mg/kg, about 4 to about 50 mg/kg, about 4.5 to about 50 mg/kg, about 5 to about 50 mg/kg, about 7.5 to about 50 mg/kg, about 10 to about 50 mg/kg, about 15 to about 50 mg/kg, about 20 to about 50 mg/kg, about 20 to about 50 mg/kg, about 25 to about 50 mg/kg, about 25 to about 50 mg/kg, about 30 to about 50 mg/kg, about 35 to about 50 mg/kg, about 40 to about 50 mg/kg, about 45 to about 50 mg/kg, about 0.1 to about 45 mg/kg, about 0.25 to about 45 mg/kg, about 0.5 to about 45 mg/kg, about 0.75 to about 45 mg/kg, about 1 to about 45 mg/mg, about 1.5 to about 45 mg/kb, about 2 to about 45 mg/kg, about 2.5 to about 45 mg/kg, about 3 to about 45 mg/kg, about 3.5 to about 45 mg/kg, about 4 to about 45 mg/kg, about 4.5 to about 45 mg/kg, about 5 to about 45 mg/kg, about 7.5 to about 45 mg/kg, about 10 to about 45 mg/kg, about 15 to about 45 mg/kg, about 20 to about 45 mg/kg, about 20 to about 45 mg/kg, about 25 to about 45 mg/kg, about 25 to about 45 mg/kg, about 30 to about 45 mg/kg, about 35 to about 45 mg/kg, about 40 to about 45 mg/kg, about 0.1 to about 40 mg/kg, about 0.25 to about 40 mg/kg, about 0.5 to about 40 mg/kg, about 0.75 to about 40 mg/kg, about 1 to about 40 mg/mg, about 1.5 to about 40 mg/kb, about 2 to about 40 mg/kg, about 2.5 to about 40 mg/kg, about 3 to about 40 mg/kg, about 3.5 to about 40 mg/kg, about 4 to about 40 mg/kg, about 4.5 to about 40 mg/kg, about 5 to about 40 mg/kg, about 7.5 to about 40 mg/kg, about 10 to about 40 mg/kg, about 15 to about 40 mg/kg, about 20 to about 40 mg/kg, about 20 to about 40 mg/kg, about 25 to about 40 mg/kg, about 25 to about 40 mg/kg, about 30 to about 40 mg/kg, about 35 to about 40 mg/kg, about 0.1 to about 30 mg/kg, about 0.25 to about 30 mg/kg, about 0.5 to about 30 mg/kg, about 0.75 to about 30 mg/kg, about 1 to about 30 mg/mg, about 1.5 to about 30 mg/kb, about 2 to about 30 mg/kg, about 2.5 to about 30 mg/kg, about 3 to about 30 mg/kg, about 3.5 to about 30 mg/kg, about 4 to about 30 mg/kg, about 4.5 to about 30 mg/kg, about 5 to about 30 mg/kg, about 7.5 to about 30 mg/kg, about 10 to about 30 mg/kg, about 15 to about 30 mg/kg, about 20 to about 30 mg/kg, about 20 to about 30 mg/kg, about 25 to about 30 mg/kg, about 0.1 to about 20 mg/kg, about 0.25 to about 20 mg/kg, about 0.5 to about 20 mg/kg, about 0.75 to about 20 mg/kg, about 1 to about 20 mg/mg, about 1.5 to about 20 mg/kb, about 2 to about 20 mg/kg, about 2.5 to about 20 mg/kg, about 3 to about 20 mg/kg, about 3.5 to about 20 mg/kg, about 4 to about 20 mg/kg, about 4.5 to about 20 mg/kg, about 5 to about 20 mg/kg, about 7.5 to about 20 mg/kg, about 10 to about 20 mg/kg, or about 15 to about 20 mg/kg. Values and ranges intermediate to the recited values are also intended to be part of this invention.

For example, subjects can be administered a therapeutic amount of dsRNA, such as about 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9, 9.1, 9.2, 9.3, 9.4, 9.5, 9.6, 9.7, 9.8, 9.9, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or about 50 mg/kg. Values and ranges intermediate to the recited values are also intended to be part of this invention.

The dsRNA can be administered by intravenous infusion over a period of time, such as over a 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or about a 25 minute period. The administration may be repeated, for example, on a regular basis, such as biweekly (i.e., every two weeks) for one month, two months, three months, four months or longer. After an initial treatment regimen, the treatments can be administered on a less frequent basis. For example, after administration biweekly for three months, administration can be repeated once per month, for six months or a year or longer. Administration of the dsRNA can reduce PROC levels, e.g., in a cell, tissue, blood, urine or other compartment of the patient by at least about 5%, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 39, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, or at least about 99% or more.

Before administration of a full dose of the dsRNA, patients can be administered a smaller dose, such as a 5% infusion reaction, and monitored for adverse effects, such as an allergic reaction. In another example, the patient can be monitored for unwanted immunostimulatory effects, such as increased cytokine (e.g., TNF-alpha or INF-alpha) levels.

Owing to the inhibitory effects on PROC expression, a composition according to the invention or a pharmaceutical composition prepared there from can enhance the quality of life.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the dsRNAs and methods featured in the invention, suitable methods and materials are described below. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety. In case of conflict, the present specification, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and not intended to be limiting.

EXAMPLES Example 1 dsRNA Synthesis

Source of Reagents

Where the source of a reagent is not specifically given herein, such reagent may be obtained from any supplier of reagents for molecular biology at a quality/purity standard for application in molecular biology.

siRNA Synthesis

Single-stranded RNAs were produced by solid phase synthesis on a scale of 1 μmole using an Expedite 8909 synthesizer (Applied Biosystems, Applera Deutschland GmbH, Darmstadt, Germany) and controlled pore glass (CPG, 500 Å, Proligo Biochemie GmbH, Hamburg, Germany) as solid support. RNA and RNA containing 2′-O-methyl nucleotides were generated by solid phase synthesis employing the corresponding phosphoramidites and 2′-O-methyl phosphoramidites, respectively (Proligo Biochemie GmbH, Hamburg, Germany). These building blocks were incorporated at selected sites within the sequence of the oligoribonucleotide chain using standard nucleoside phosphoramidite chemistry such as described in Current protocols in nucleic acid chemistry, Beaucage, S. L. et al. (Edrs.), John Wiley & Sons, Inc., New York, N.Y., USA. Phosphorothioate linkages were introduced by replacement of the iodine oxidizer solution with a solution of the Beaucage reagent (Chruachem Ltd, Glasgow, UK) in acetonitrile (1%). Further ancillary reagents were obtained from Mallinckrodt Baker (Griesheim, Germany).

Deprotection and purification of the crude oligoribonucleotides by anion exchange HPLC were carried out according to established procedures. Yields and concentrations were determined by UV absorption of a solution of the respective RNA at a wavelength of 260 nm using a spectral photometer (DU 640B, Beckman Coulter GmbH, Unterschleiβheim, Germany). Double stranded RNA was generated by mixing an equimolar solution of complementary strands in annealing buffer (20 mM sodium phosphate, pH 6.8; 100 mM sodium chloride), heated in a water bath at 85-90° C. for 3 minutes and cooled to room temperature over a period of 3-4 hours. The annealed RNA solution was stored at −20° C. until use.

Nucleic acid sequences are represented below using standard nomenclature, and specifically the abbreviations of Table B.

TABLE B Abbreviations. Abbreviation Nucleotide(s) A adenosine-3′-phosphate C cytidine-3′-phosphate G guanosine-3′-phosphate U uridine-3′-phosphate N any nucleotide (G, A, C, or T) a 2′-O-methyladenosine-3′-phosphate c 2′-O-methylcytidine-3′-phosphate g 2′-O-methylguanosine-3′-phosphate u 2′-O-methyluridine-3′-phosphate T, dT 2′-deoxythymidine-3′-phosphate sT; sdT 2′-deoxy-thymidine-5′phosphate-phosphorothioate

Example 2 PROC siRNA Design

Transcripts

siRNA design was carried out to identify siRNAs targeting all human and rhesus monkey (Macaca mulatta; henceforth “rhesus”) PROC transcripts annotated in the NCBI Gene database (http://www.ncbi.nlm.nih.gov/gene/). All siRNA duplexes were designed that shared 100% identity with the listed human and rhesus transcripts. A subset of siRNA duplexes (see below) also targeted the dog (Canis familiaris) PROC transcript found in NCBI Gene. Design used the following transcripts from NCBI: Human—NM_(—)000312.2; Rhesus—XM_(—)001087196.2; Dog—NM_(—)001013849.1.

siRNA Design, Specificity, and Efficacy Prediction

The siRNAs were selected based on predicted specificity, predicted efficacy, and GC content.

The predicted specificity of all possible 19mers was predicted from each sequence. Candidate 19mers were then selected that lacked repeats longer than 7 nucleotides. These 799 candidate human/rhesus siRNAs, and a subset of 102 that also matched dog (“human/rhesus/dog candidate siRNAs”) were then used in a comprehensive search against the human transcriptome (defined as the set of NM_ and XM_ records within the human NCBI Refseq set) using an exhaustive “brute-force” algorithm. A score was calculated based on the position and number of mismatches between the siRNA and any potential ‘off-target’ transcript and comparing the frequency of heptamers and octomers derived from 3 distinct, seed (in positions 2-9 from the 5′ end of the molecule.)-derived hexamers of each oligo. Both siRNAs strands were assigned to a category of specificity according to the calculated scores: a score above 3 qualifies as highly specific, equal to 3 as specific and between 2.2 and 2.8 as moderately specific. We sorted by the specificity of the antisense strand. We then selected duplexes from the human/rhesus set whose antisense oligos lacked miRNA seed matches, had scores of 2.2 or better, less than 65% overall GC content, no GC at the first position, and 3 or more Us or As in the seed region. We also selected duplexes from the human/rhesus/dog set whose antisense oligos had scores of 2 or better, no GC at the first position, and 3 or more Us or As in the seed region.

siRNA Sequence Selection

A total of 47 sense and 47 antisense derived siRNA oligos from the human/rhesus set were synthesized and formed into duplexes. A total of 10 sense and 10 antisense derived siRNAs from the human/rhesus/dog set were synthesized and formed into duplexes.

Example 3 PROC siRNA Synthesis

PROC tiled sequences were synthesized on MerMade 192 synthesizer at 0.2 umol scale. Sequences that target PROC in human rhesus, human rhesus dog and mouse-rat were synthesized and duplexes were made.

For all the sequences in the list, ‘endolight’ chemistry was applied as detailed below.

-   -   All pyrimidines (cytosine and uridine) in the sense strand         contained 2′-O-Methyl bases (2′ O-Methyl C and 2′-O-Methyl U)     -   In the antisense strand, pyrimidines adjacent to (towards 5′         position) ribo A nucleoside were replaced with their         corresponding 2-O-Methyl nucleosides     -   A two base dTsdT extension at 3′ end of both sense and anti         sense sequences was introduced     -   The sequence file was converted to a text file to make it         compatible for loading in the MerMade 192 synthesis software

Synthesis, Cleavage and Deprotection:

The synthesis of PROC sequences used solid supported oligonucleotide synthesis using phosphoramidite chemistry.

The synthesis of the above sequences was performed at 0.2 um scale in 96 well plates. The amidite solutions were prepared at 0.1M concentration and ethyl thio tetrazole (0.6M in Acetonitrile) was used as activator.

The synthesized sequences were cleaved and deprotected in 96 well plates, using methylamine in the first step and fluoride reagent in the second step. The crude sequences were precipitated using acetone:ethanol (80:20) mix and the pellet were re-suspended in 0.2M sodium acetate buffer. Samples from each sequence were analyzed by LC-MS to confirm the identity, UV for quantification and a selected set of samples by IEX chromatography to determine purity.

Purification and Desalting:

PROC tiled sequences were precipitated and purified on AKTA Purifier system using Sephadex column. The process was run at ambient temperature. Sample injection and collection was performed in 96 well (1.8 mL-deep well) plates. A single peak corresponding to the full length sequence was collected in the eluent. The desalted PROC sequences were analyzed for concentration (by UV measurement at A260) and purity (by ion exchange HPLC). The complementary single strands were then combined in a 1:1 stoichiometric ratio to form siRNA duplexes.

PROC Single Strands and Duplexes:

Detailed lists of unconjugated PROC single strands and duplexes are shown in Table 1, Table 2 and Table 5, below. Detailed lists of conjugated PROC single strands and duplexes are shown in Table 8 and Table 9, below.

Example 4 PROC siRNA In Vitro Screening

Cell Culture and Transfections:

Hep3B cells (ATCC, Manassas, Va.) were grown to near confluence at 37° C. in an atmosphere of 5% CO₂ in MEM (ATCC) supplemented with 10% FBS, before being released from the plate by trypsinization. Transfection was carried out by adding 14.8 μl of Opti-MEM plus 0.2 μl of Lipofectamine RNAiMax per well (Invitrogen, Carlsbad Calif. cat #13778-150) to 5 μl of siRNA duplexes per well into a 96-well plate and incubated at room temperature for 15 minutes. 80 μl of complete growth media containing ˜2×10⁴ Hep3B cells were then added to the siRNA mixture. Cells were incubated for either 24 or 120 hours prior to RNA purification. Single dose experiments were performed at 10 nM and 0.1 nM final duplex concentration (Table 3) and dose response experiments were done at 10, 1.67, 0.27, 0.046, 0.0077, 0.0013, 0.00021, 0.00004 nM final duplex concentration (Table 4 and Table 7).

GalNac conjugated siRNAs were tested by transfection at doses of 100 nM, 10 nM and 0.1 nM. Results are shown in Table 11. siRNAs derived from the AD-48988 and AD-48788 sequences were tested at 10 nM, 0.1 nM, 0.01 nM and 0.001 nM. Results are shown in Table 6.

Free Uptake Transfection

5 ul of each GalNac conjugated siRNA in PBS was combined with 4×10⁴ freshly thawed cryopreserved Cynomolgus monkey hepatocytes resuspended in 95 ul of In Vitro Gro CP media (In Vitro Technologies-Celsis, Baltimore, Md.) in each well of a 96 well plate. The mixture was incubated for about 24 hrs at 37° C. in an atmosphere of 5% CO₂. siRNAs were tested at final concentrations of 100 nM, 10 nM and 0.1 nM for efficacy free uptake assays. Results are shown in Table 10.

Total RNA Isolation Using DYNABEADS mRNA Isolation Kit (Invitrogen, Part #: 610-12

Cells were harvested and lysed in 150 μl of Lysis/Binding Buffer then mixed for five minutes at 850 rpm using an Eppendorf Thermomixer (the mixing speed was the same throughout the process). Ten microliters of magnetic beads and 80 μl Lysis/Binding Buffer mixture were added to a round bottom plate and mixed for 1 minute. Magnetic beads were captured using magnetic stand and the supernatant was removed without disturbing the beads. After removing supernatant, the lysed cells were added to the remaining beads and mixed for five minutes. After removing supernatant, magnetic beads were washed two times with 150 μl Wash Buffer A and mixed for one minute. Beads were capture again and supernatant removed. Beads were then washed with 150 μl Wash Buffer B, captured and supernatant was removed. Beads were next washed with 150 μl Elution Buffer, captured and supernatant removed. Beads were allowed to dry for two minutes. After drying, 50 μl of Elution Buffer was added and mixed for five minutes at 70° C. Beads were captured on magnet for five minutes. 40 μl of supernatant was removed and added to another 96 well plate.

cDNA Synthesis Using ABI High Capacity cDNA Reverse Transcription Kit (Applied Biosystems, Foster City, Calif., Cat #4368813):

A master mix of 2 μl 10× Buffer, 0.8 μl 25×dNTPs, 2 μl Random primers, 1 μl Reverse Transcriptase, 1 μl RNase inhibitor and 3.2 μl of H2O per reaction were added into 10 μl total RNA. cDNA was generated using a Bio-Rad C-1000 or S-1000 thermal cycler (Hercules, Calif.) through the following steps: 25° C. 10 min, 37° C. 120 min, 85° C. 5 sec, 4° C. hold.

Real Time PCR:

2 μl of cDNA were added to a master mix containing 0.5 μl GAPDH TaqMan Probe (Applied Biosystems Cat #4326317E), 0.5 μl PROC TaqMan probe (Applied Biosystems cat #Hs00165584_m1) and 5 μl Lightcycler 480 probe master mix (Roche Cat #04887301001) per well in a 384 well 50 plates (Roche cat #04887301001). Real time PCR was done in an ABI 7900HT Real Time PCR system (Applied Biosystems) using the ΔΔCt(RQ) assay. Each duplex was tested in two independent transfections with two biological replicates each, and each transfection was assayed in duplicate, unless otherwise noted in the summary tables.

To calculate relative fold change, real time data were analyzed using the ΔΔCt method and normalized to assays performed with cells transfected with 10 nM AD-1955, or mock transfected cells. IC50s were calculated using a 4 parameter fit model using XLFit and normalized to cells transfected with AD-1955 or naïve cells over the same dose range, or to its own lowest dose.

The results are shown in Table 3, Table 4, Table 6, Table 7, Table 10, and Table 11.

Example 5 PROC siRNA In Vivo Testing in Mice

Two siRNA targeting PROC, AD-48926 and AD-48953, were administered to mice and the effect on target mRNA was determined. AD-48962 was designed to target the mouse PROC mRNA NM_(—)001042767.1 nucleotides 258-276. AD-48953 was designed to target the mouse PROC mRNA NM_(—)001042767.1 nucleotides 1523-1541. Sequences are as follows:

AD-48926.2 modfied sense strand GuAuGGAGGAGAucuGuGAdTsdT (SEQ ID NO: 493) unmodified sense strand GUAUGGAGGAGAUCUGUGA (SEQ ID NO: 494) modified antisense strand UcAcAGAUCUCCUCcAuACdTsdT (SEQ ID NO: 495) unmodifed antisense strand UCACAGAUCUCCUCCAUAC (SEQ ID NO: 496) AD-48953.2 modified sense strand GcuAGuGAGuAccAAGAcAdTsdT (SEQ ID NO: 497) unmodifed sense strand GCUAGUGAGUACCAAGACA (SEQ ID NO: 498) modified antisense strand UGUCUUGGuACUcACuAGCdTsdT (SEQ ID NO: 499) unmodifed antisense strand UGUCUUGGUACUCACUAGC (SEQ ID NO: 500)

Each modified strand of each siRNA was synthesized and siRNA were formed as described herein. The siRNA were formulated in an LNP-11 formulation. Female C57B16 mice were administered lipid formulated siRNA at 0.003, 0.01, 0.03, 0.1, 0.3, and 1.0 mg/kg. Mice were sacrificed 24 hours post injection and PROC mRNA levels were determined.

The results are shown in FIG. 1. Administration of the siRNA targeting PROC resulted in a knock down in mRNA levels with an ED50 around 0.02 mg/kg. The IC50 of AD-48926 was 30 pM and AD-48952 was 34 pM (data not shown). The results demonstrate that PROC is a validated target for siRNA based treatment of, e.g., hemophilia.

Example 6 Duration of Action of PROC Targeting siRNA

Lipid formulated D-48953 and control AD-1955 were administered to mice to examine the duration of mRNA inhibition.

Mice were administered LNP-11 formulated siRNA at a dosage of 0.3 mg/kg. Mice were sacrificed at days 1, 2, 3, 7, and 16. Whole frozen liver was collected and assayed for PROC mRNA levels.

The results are shown in FIG. 2. Administration of AD-48953 resulted in maximum inhibition of 90% which was maintained through day 3. At day 7, mRNA inhibition was at 85%; at day 16, mRNA inhibition was at 75%. The results demonstrate robust and durable PROC mRNA inhibition by siRNA.

Example 7 Additional Testing of PROC siRNAs

Two modified siRNAs targeting PROC, AD-56164 (derived from AD-48878; IC₅₀˜6 pM) and AD-56165 (derived from AD-48898; IC₅₀˜15 pM), were identified as highly potent. Both siRNAs are human/cyno cross reactive. AD-56164 was designed to target human Protein C NM_(—)000312.2 mRNA nucleotides 1191-1209. AD-56165 was designed to target human Protein C NM_(—)000312.2 mRNA nucleotides 273-291.

The AD-56164 and AD-56165 sequences are as follows:

AD-56164 modified sense strand GcAGcGAGGucAuGAGcAAdTdT (SEQ ID NO: 501) unmodified sense strand GCAGCGAGGUCAUGAGCAA (SEQ ID NO: 502) modified antisense strand UUGCUcAUGACCUCGCUGCdTdT (SEQ ID NO: 503) unmodifed antisense strand UUGCUCAUGACCUCGCUGC (SEQ ID NO: 504) AD-56165 modified sense strand uAGAGGAGAucuGuGAcuudTdT (SEQ ID NO: 505) unmodifed sense strand UAGAGGAGAUCUGUGACUU (SEQ ID NO: 506) modified antisense strand AAGUcAcAGAUCUCCUCuAdTdT (SEQ ID NO: 507) unmodifed antisense strand AAGUCACAGAUCUCCUCUA (SEQ ID NO: 508)

Each modified strand of each siRNA is synthesized and siRNA is formed as described herein. The siRNA is formulated in an LNP-11 formulation. Female C57B16 mice are administered lipid formulated siRNA as described above. Mice are sacrificed and PROC mRNA levels are determined.

Dose response studies are performed with different animals, e.g., WT (Negrier), HA (Lillicrap), and HB (Negrier). LNP-PC is dosed at 0.003-1 mg/kg at 72 h with and without FVIII/FIX addition. Protein C mRNA levels in liver are measured. A FeCl₃ microvessel injury model is used for testing animal response to LNP-PC addition.

TABLE 1 PROC siRNA: modified sequences SEQ SEQ Duplex ID ID name NO: Sense Sequence NO: Antisense Sequence AD-48901.1  2 AcuucAucAAGAuucccGudTsdT  54 ACGGGAAUCUUGAUGAAGUdTsdT AD-48880.1  3 GAcucAGuGuucuccAGcAdTsdT  55 UGCUGGAGAAcACUGAGUCdTsdT AD-48904.1  4 cGAGGAGGccAAGGAAAuudTsdT  56 AAUUUCCUUGGCCUCCUCGdTsdT AD-48950.1  5 cuGcuGGAcucAAAGAAGAdTsdT  57 UCUUCUUUGAGUCcAGcAGdTsdT AD-48879.1  6 uucAcAAcuAcGGcGuuuAdTsdT  58 uAAACGCCGuAGUUGUGAAdTsdT AD-48877.1  7 uccAAGAAGcuccuuGucAdTsdT  59 UGAcAAGGAGCUUCUUGGAdTsdT AD-48920.1  8 cuucAcAAcuAcGGcGuuudTsdT  60 AAACGCCGuAGUUGUGAAGdTsdT AD-48902.1  9 uGGuGucuGAGAAcAuGcudTsdT  61 AGcAUGUUCUcAGAcACcAdTsdT AD-48946.1 10 uGGuccuGcuGGAcucAAAdTsdT  62 UUUGAGUCcAGcAGGACcAdTsdT AD-48954.1 11 uGcuGGAcucAAAGAAGAAdTsdT  63 UUCUUCUUUGAGUCcAGcAdTsdT AD-48883.1 12 uuGucAGGcuuGGAGAGuAdTsdT  64 uACUCUCcAAGCCUGAcAAdTsdT AD-48929.1 13 uuccAAAAuGuGGAuGAcAdTsdT  65 UGUcAUCcAcAUUUUGGAAdTsdT AD-48919.1 14 uGcAGcGAGGucAuGAGcAdTsdT  66 UGCUcAUGACCUCGCUGcAdTsdT AD-48896.1 15 AGGucAuGAGcAAcAuGGudTsdT  67 ACcAUGUUGCUcAUGACCUdTsdT AD-48925.1 16 uGGAcucAAAGAAGAAGcudTsdT  68 AGCUUCUUCUUUGAGUCcAdTsdT AD-48918.1 17 AuuGAuGGGAAGAuGAccAdTsdT  69 UGGUcAUCUUCCcAUcAAUdTsdT AD-48892.1 18 GGuGcuGcGGAuccGcAAAdTsdT  70 UUUGCGGAUCCGcAGcACCdTsdT AD-48915.1 19 GGGAuAcucuGuuuAuGAAdTsdT  71 UUcAuAAAcAGAGuAUCCCdTsdT AD-48889.1 20 uGucAGGcuuGGAGAGuAudTsdT  72 AuACUCUCcAAGCCUGAcAdTsdT AD-48924.1 21 uuuuccAAAAuGuGGAuGAdTsdT  73 UcAUCcAcAUUUUGGAAAAdTsdT AD-48910.1 22 ccAAAAuGuGGAuGAcAcAdTsdT  74 UGUGUcAUCcAcAUUUUGGdTsdT AD-48897.1 23 AcuAcGGcGuuuAcAccAAdTsdT  75 UUGGUGuAAACGCCGuAGUdTsdT AD-48900.1 24 AGAuccGcGGcucAuuGAudTsdT  76 AUcAAUGAGCCGCGGAUCUdTsdT AD-48890.1 25 GcGAGGucAuGAGcAAcAudTsdT  77 AUGUUGCUcAUGACCUCGCdTsdT AD-48876.1 26 GcGAGGuGAGcuuccucAAdTsdT  78 UUGAGGAAGCUcACCUCGCdTsdT AD-48885.1 27 cAcAAcuAcGGcGuuuAcAdTsdT  79 UGuAAACGCCGuAGUUGUGdTsdT AD-48930.1 28 GcGGGGcAGuGcucAuccAdTsdT  80 UGGAUGAGcACUGCCCCGCdTsdT AD-48888.1 29 AGuAGAuccGcGGcucAuudTsdT  81 AAUGAGCCGCGGAUCuACUdTsdT AD-48884.1 30 AGcGAGGucAuGAGcAAcAdTsdT  82 UGUUGCUcAUGACCUCGCUdTsdT AD-48916.1 31 GAuGAcAcAcuGGccuucudTsdT  83 AGAAGGCcAGUGUGUcAUCdTsdT AD-48891.1 32 AAcuAcGGcGuuuAcAccAdTsdT  84 UGGUGuAAACGCCGuAGUUdTsdT AD-48903.1 33 GGucuAAAGcuGuGuGuGudTsdT  85 AcAcAcAcAGCUUuAGACCdTsdT AD-48882.1 34 GcGcAGucAccuGAAAcGAdTsdT  86 UCGUUUcAGGUGACUGCGCdTsdT AD-48917.1 35 cGcGAGGuGAGcuuccucAdTsdT  87 UGAGGAAGCUcACCUCGCGdTsdT AD-48912.1 36 cGcGGcucAuuGAuGGGAAdTsdT  88 UUCCcAUcAAUGAGCCGCGdTsdT AD-48908.1 37 uGuGGGcuccuucAcAAcudTsdT  89 AGUUGUGAAGGAGCCcAcAdTsdT AD-48911.1 38 GuGAccAGuGcuuGGucuudTsdT  90 AAGACcAAGcACUGGUcACdTsdT AD-48875.1 39 GAcAcAcuGGccuucuGGudTsdT  91 ACcAGAAGGCcAGUGUGUCdTsdT AD-48934.1 40 cAGGuGGuccuGcuGGAcudTsdT  92 AGUCcAGcAGGACcACCUGdTsdT AD-48894.1 41 uAGAuccGcGGcucAuuGAdTsdT  93 UcAAUGAGCCGCGGAUCuAdTsdT AD-48906.1 42 ccGcGGcucAuuGAuGGGAdTsdT  94 UCCcAUcAAUGAGCCGCGGdTsdT AD-48938.1 43 GGuGGuccuGcuGGAcucAdTsdT  95 UGAGUCcAGcAGGACcACCdTsdT AD-48893.1 44 cAcGucGAcGGuGAccAGudTsdT  96 ACUGGUcACCGUCGACGUGdTsdT AD-48886.1 45 AGGuGcuGcGGAuccGcAAdTsdT  97 UUGCGGAUCCGcAGcACCUdTsdT AD-48881.1 46 AcAcuGGccuucuGGuccAdTsdT  98 UGGACcAGAAGGCcAGUGUdTsdT AD-48905.1 47 ucGAcGGuGAccAGuGcuudTsdT  99 AAGcACUGGUcACCGUCGAdTsdT AD-48895.1 48 ucAGGcuuGGAGAGuAuGAdTsdT 100 UcAuACUCUCcAAGCCUGAdTsdT AD-48899.1 49 GucGAcGGuGAccAGuGcudTsdT 101 AGcACUGGUcACCGUCGACdTsdT AD-48914.1 50 GuGGGcuccuucAcAAcuAdTsdT 102 uAGUUGUGAAGGAGCCcACdTsdT AD-48887.1 51 cAcuGGccuucuGGuccAAdTsdT 103 UUGGACcAGAAGGCcAGUGdTsdT AD-48913.1 52 GAGuGcAGcGAGGucAuGAdTsdT 104 UcAUGACCUCGCUGcACUCdTsdT AD-48942.1 53 GuGGuccuGcuGGAcucAAdTsdT 105 UUGAGUCcAGcAGGACcACdTsdT

TABLE 2 PROC siRNA: unmodified sequences SEQ SEQ Duplex Position in ID ID Antisense name NM_000312.2 NO: Sense Sequence NO: Sequence AD-48901.1UM 1155-1173 106 ACUUCAUCAAGAUUCCCGU 160 ACGGGAAUCUUGAUGAAGU AD-48880.1UM 143-161 107 GACUCAGUGUUCUCCAGCA 161 UGCUGGAGAACACUGAGUC AD-48904.1UM 271-289 108 CGAGGAGGCCAAGGAAAUU 162 AAUUUCCUUGGCCUCCUCG AD-48950.1UM 758-776 109 CUGCUGGACUCAAAGAAGA 163 UCUUCUUUGAGUCCAGCAG AD-48879.1UM 1359-1377 110 UUCACAACUACGGCGUUUA 164 UAAACGCCGUAGUUGUGAA AD-48877.1UM 845-863 111 UCCAAGAAGCUCCUUGUCA 165 UGACAAGGAGCUUCUUGGA AD-48920.1UM 1358-1376 112 CUUCACAACUACGGCGUUU 166 AAACGCCGUAGUUGUGAAG AD-48902.1UM 1212-1230 113 UGGUGUCUGAGAACAUGCU 167 AGCAUGUUCUCAGACACCA AD-48946.1UM 753-771 114 UGGUCCUGCUGGACUCAAA 168 UUUGAGUCCAGCAGGACCA AD-48954.1UM 759-777 115 UGCUGGACUCAAAGAAGAA 169 UUCUUCUUUGAGUCCAGCA AD-48883.1UM 858-876 116 UUGUCAGGCUUGGAGAGUA 170 UACUCUCCAAGCCUGACAA AD-48929.1UM 290-308 117 UUCCAAAAUGUGGAUGACA 171 UGUCAUCCACAUUUUGGAA AD-48919.1UM 1190-1208 118 UGCAGCGAGGUCAUGAGCA 172 UGCUCAUGACCUCGCUGCA AD-48896.1UM 1197-1215 119 AGGUCAUGAGCAACAUGGU 173 ACCAUGUUGCUCAUGACCU AD-48925.1UM 762-780 120 UGGACUCAAAGAAGAAGCU 174 AGCUUCUUCUUUGAGUCCA AD-48918.1UM 710-728 121 AUUGAUGGGAAGAUGACCA 175 UGGUCAUCUUCCCAUCAAU AD-48892.1UM 178-196 122 GGUGCUGCGGAUCCGCAAA 176 UUUGCGGAUCCGCAGCACC AD-48915.1UM 1712-1730 123 GGGAUACUCUGUUUAUGAA 177 UUCAUAAACAGAGUAUCCC AD-48889.1UM 859-877 124 UGUCAGGCUUGGAGAGUAU 178 AUACUCUCCAAGCCUGACA AD-48924.1UM 288-306 125 UUUUCCAAAAUGUGGAUGA 179 UCAUCCACAUUUUGGAAAA AD-48910.1UM 292-310 126 CCAAAAUGUGGAUGACACA 180 UGUGUCAUCCACAUUUUGG AD-48897.1UM 1365-1383 127 ACUACGGCGUUUACACCAA 181 UUGGUGUAAACGCCGUAGU AD-48900.1UM 697-715 128 AGAUCCGCGGCUCAUUGAU 182 AUCAAUGAGCCGCGGAUCU AD-48890.1UM 1194-1212 129 GCGAGGUCAUGAGCAACAU 183 AUGUUGCUCAUGACCUCGC AD-48876.1UM 471-489 130 GCGAGGUGAGCUUCCUCAA 184 UUGAGGAAGCUCACCUCGC AD-48885.1UM 1361-1379 131 CACAACUACGGCGUUUACA 185 UGUAAACGCCGUAGUUGUG AD-48930.1UM 786-804 132 GCGGGGCAGUGCUCAUCCA 186 UGGAUGAGCACUGCCCCGC AD-48888.1UM 694-712 133 AGUAGAUCCGCGGCUCAUU 187 AAUGAGCCGCGGAUCUACU AD-48884.1UM 1193-1211 134 AGCGAGGUCAUGAGCAACA 188 UGUUGCUCAUGACCUCGCU AD-48916.1UM 302-320 135 GAUGACACACUGGCCUUCU 189 AGAAGGCCAGUGUGUCAUC AD-48891.1UM 1364-1382 136 AACUACGGCGUUUACACCA 190 UGGUGUAAACGCCGUAGUU AD-48903.1UM 1688-1706 137 GGUCUAAAGCUGUGUGUGU 191 ACACACACAGCUUUAGACC AD-48882.1UM 652-670 138 GCGCAGUCACCUGAAACGA 192 UCGUUUCAGGUGACUGCGC AD-48917.1UM 470-488 139 CGCGAGGUGAGCUUCCUCA 193 UGAGGAAGCUCACCUCGCG AD-48912.1UM 702-720 140 CGCGGCUCAUUGAUGGGAA 194 UUCCCAUCAAUGAGCCGCG AD-48908.1UM 1349-1367 141 UGUGGGCUCCUUCACAACU 195 AGUUGUGAAGGAGCCCACA AD-48911.1UM 339-357 142 GUGACCAGUGCUUGGUCUU 196 AAGACCAAGCACUGGUCAC AD-48875.1UM 305-323 143 GACACACUGGCCUUCUGGU 197 ACCAGAAGGCCAGUGUGUC AD-48934.1UM 749-767 144 CAGGUGGUCCUGCUGGACU 198 AGUCCAGCAGGACCACCUG AD-48894.1UM 696-714 145 UAGAUCCGCGGCUCAUUGA 199 UCAAUGAGCCGCGGAUCUA AD-48906.1UM 701-719 146 CCGCGGCUCAUUGAUGGGA 200 UCCCAUCAAUGAGCCGCGG AD-48938.1UM 751-769 147 GGUGGUCCUGCUGGACUCA 201 UGAGUCCAGCAGGACCACC AD-48893.1UM 329-347 148 CACGUCGACGGUGACCAGU 202 ACUGGUCACCGUCGACGUG AD-48886.1UM 177-195 149 AGGUGCUGCGGAUCCGCAA 203 UUGCGGAUCCGCAGCACCU AD-48881.1UM 308-326 150 ACACUGGCCUUCUGGUCCA 204 UGGACCAGAAGGCCAGUGU AD-48905.1UM 333-351 151 UCGACGGUGACCAGUGCUU 205 AAGCACUGGUCACCGUCGA AD-48895.1UM 861-879 152 UCAGGCUUGGAGAGUAUGA 206 UCAUACUCUCCAAGCCUGA AD-48899.1UM 332-350 153 GUCGACGGUGACCAGUGCU 207 AGCACUGGUCACCGUCGAC AD-48914.1UM 1350-1368 154 GUGGGCUCCUUCACAACUA 208 UAGUUGUGAAGGAGCCCAC AD-48887.1UM 309-327 155 CACUGGCCUUCUGGUCCAA 209 UUGGACCAGAAGGCCAGUG AD-48913.1UM 1187-1205 156 GAGUGCAGCGAGGUCAUGA 210 UCAUGACCUCGCUGCACUC AD-48942.1UM 752-770 157 GUGGUCCUGCUGGACUCAA 211 UUGAGUCCAGCAGGACCAC AD-48878.1UM 1191-1209 158 GCAGCGAGGUCAUGAGCAA 212 UUGCUCAUGACCUCGCUGC AD-48898.1UM 273-291 159 UAGAGGAGAUCUGUGACUU 213 AAGUCACAGAUCUCCUCUA

TABLE 3 PROC modified siRNA single dose screen 0.1 nM 10.0 nM Duplex Avg Avg AD-48878 0.23 0.144 AD-48898 0.30 0.206 AD-48907 0.36 0.254 AD-48901 0.37 0.274 AD-48880 0.38 0.231 AD-48904 0.40 0.231 AD-48950 0.44 0.276 AD-48879 0.46 0.248 AD-48877 0.47 0.522 AD-48920 0.48 0.306 AD-48902 0.49 0.218 AD-48946 0.50 0.366 AD-48954 0.50 0.325 AD-48883 0.50 0.294 AD-48929 0.50 0.338 AD-48919 0.55 0.335 AD-48896 0.55 0.287 AD-48925 0.57 0.363 AD-48918 0.58 0.301 AD-48892 0.61 0.333 AD-48915 0.69 0.666 AD-48889 0.71 0.378 AD-48924 0.75 0.489 AD-48910 0.79 0.361 AD-48897 0.81 0.834 AD-48900 0.83 0.563 AD-48890 0.83 0.515 AD-48876 0.84 0.681 AD-48885 0.85 0.714 AD-48930 0.87 0.511 AD-48888 0.88 0.989 AD-48884 0.89 0.780 AD-48916 0.89 0.670 AD-48891 0.89 0.822 AD-48903 0.89 0.606 AD-48882 0.91 0.685 AD-48917 0.92 0.755 AD-48912 0.93 0.775 AD-48908 0.95 0.913 AD-48911 0.96 0.617 AD-48875 0.98 0.882 AD-48934 0.99 0.889 AD-48894 1.00 0.992 AD-48906 1.01 0.909 AD-48938 1.03 1.030 AD-48893 1.03 0.950 AD-48886 1.03 0.900 AD-48881 1.03 0.984 AD-48905 1.04 0.909 AD-48895 1.06 0.884 AD-48899 1.08 0.980 AD-48914 1.09 0.903 AD-48887 1.10 0.964 AD-48913 1.12 0.904 AD-48942 1.13 1.010

TABLE 4 PROC modified siRNA IC50 data IC50 (nM) Duplex IC50 1 IC50 2 Avg IC50 AD-48878 0.005 0.007 0.006 AD-48898 0.015 0.014 0.014 AD-48907 0.023 0.020 0.021 AD-48901 0.035 0.052 0.043 AD-48880 0.046 0.074 0.060 AD-48904 0.020 0.042 0.031 AD-48950 0.019 0.156 0.087 AD-48879 0.096 0.067 0.081 AD-48877 0.036 0.118 0.077 AD-48920 0.052 0.027 0.039 AD-48902 0.114 0.177 0.146 AD-48946 0.241 0.579 0.410 AD-48954 0.134 0.487 0.311 AD-48929 0.026 0.024 0.025 AD-48925 0.521 0.572 0.546

TABLE 5 AD-48878 and AD-48898 derived duplexes for targeting Protein C SEQ SEQ Parental Duplex ID ID Antisense strand duplex name NO: Sense strand sequence NO: sequence name AD-53836.1 214 GcAGcGAGGucAuGAGcAAdTdT 263 UUGCUcAUGACCUCGCUGcdTdT AD-48878 AD-53837.1 215 GcAGcGAGGucAuGAGcAAdTdT 264 UUGCuCAUGACCUCGCUGcdTdT AD-48878 AD-53842.1 216 GcAGcGAGGucAuGAGcAAdTdT 265 UUGCUcAUGACCUCGCuGcdTdT AD-48878 AD-53843.1 217 GcAGcGAGGucAuGAGcAAdTdT 266 UUGCuCAUGACCUCGCuGcdTdT AD-48878 AD-53848.1 218 GcAGcGAGGucAuGAGcAAdTdT 267 UUGCUcAUGACCUCGcuGcdTdT AD-48878 AD-53849.1 219 GcAGcGAGGucAuGAGcAAdTdT 268 UUGCuCAUGACCUCGcuGcdTdT AD-48878 AD-53854.1 220 GcAGcGAGGucAuGAGcAAdTdT 269 UUGCUcAUGACCuCGCuGcdTdT AD-48878 AD-53855.1 221 GcAGcGAGGucAuGAGcAAdTdT 270 UUGCuCAUGACCuCGCuGcdTdT AD-48878 AD-53860.1 222 GcAGcGAGGucAuGAGcAAdTdT 271 UUGCUCAUGACCUCGCUGcdTdT AD-48878 AD-53866.1 223 GcAGcGAGGucAuGAGcAAdTdT 272 UUGCUCAUGACCUCGCuGcdTdT AD-48878 AD-53872.1 224 GcAGcGAGGucAuGAGcAAdTdT 273 UUGCUCAUGACCUCGcuGcdTdT AD-48878 AD-53878.1 225 GcAGcGAGGucAuGAGcAAdTdT 274 UUGCUCAUGACCuCGCuGcdTdT AD-48878 AD-56164.1 226 GcAGcGAGGucAuGAGcAAdTdT 275 UUGCUcAUGACCUCGCUGCdTdT AD-48878 AD-53838.1 227 GcAGcGAGGucAuGAGCAAdTdT 276 UUGCUCAUGACCUCGCUGcdTdT AD-48878 AD-53844.1 228 GcAGcGAGGucAuGAGCAAdTdT 277 UUGCUCAUGACCUCGCuGcdTdT AD-48878 AD-53850.1 229 GcAGcGAGGucAuGAGCAAdTdT 278 UUGCUCAUGACCUCGcuGcdTdT AD-48878 AD-53856.1 230 GcAGcGAGGucAuGAGCAAdTdT 279 UUGCUCAUGACCuCGCuGcdTdT AD-48878 AD-53861.1 231 GcAGcGAGGucAuGAGCAAdTdT 280 UUGCUcAUGACCUCGCUGcdTdT AD-48878 AD-53862.1 232 GcAGcGAGGucAuGAGCAAdTdT 281 UUGCuCAUGACCUCGCUGcdTdT AD-48878 AD-53867.1 233 GcAGcGAGGucAuGAGCAAdTdT 282 UUGCUcAUGACCUCGCuGcdTdT AD-48878 AD-53868.1 234 GcAGcGAGGucAuGAGCAAdTdT 283 UUGCuCAUGACCUCGCuGcdTdT AD-48878 AD-53873.1 235 GcAGcGAGGucAuGAGCAAdTdT 284 UUGCUcAUGACCUCGcuGcdTdT AD-48878 AD-53874.1 236 GcAGcGAGGucAuGAGCAAdTdT 285 UUGCuCAUGACCUCGcuGcdTdT AD-48878 AD-53879.1 237 GcAGcGAGGucAuGAGCAAdTdT 286 UUGCUcAUGACCuCGCuGcdTdT AD-48878 AD-53880.1 238 GcAGcGAGGucAuGAGCAAdTdT 287 UUGCuCAUGACCuCGCuGcdTdT AD-48878 AD-53840.1 239 uAGAGGAGAucuGuGAcuUdTdT 288 AAGUCAcAGAUCUCCUCuAdTdT AD-48898 AD-53846.1 240 uAGAGGAGAucuGuGAcuUdTdT 289 AAGUCAcAGAUCUCCUcuAdTdT AD-48898 AD-53852.1 241 uAGAGGAGAucuGuGAcuUdTdT 290 AAGUCAcAGAUCUCcUcuAdTdT AD-48898 AD-53858.1 242 uAGAGGAGAucuGuGAcuUdTdT 291 AAGUCAcAGAUcUCcUcuAdTdT AD-48898 AD-53875.1 243 uAGAGGAGAucuGuGAcuUdTdT 292 AAGUcAcAGAUCUCCUcuAdTdT AD-48898 AD-53881.1 244 uAGAGGAGAucuGuGAcuUdTdT 293 AAGUcAcAGAUCUCcUcuAdTdT AD-48898 AD-53841.1 245 uAGAGGAGAucuGuGACuUdTdT 294 AAGUCAcAGAUCUCcUcuAdTdT AD-48898 AD-53847.1 246 uAGAGGAGAucuGuGACuUdTdT 295 AAGUCAcAGAUcUCcUcuAdTdT AD-48898 AD-53853.1 247 uAGAGGAGAucuGuGACuUdTdT 296 AAGUcACAGAUCUCCUcuAdTdT AD-48898 AD-53859.1 248 uAGAGGAGAucuGuGACuUdTdT 297 AAGUcACAGAUCUCcUcuAdTdT AD-48898 AD-53864.1 249 uAGAGGAGAucuGuGACuUdTdT 298 AAGUcAcAGAUCUCCUcuAdTdT AD-48898 AD-53865.1 250 uAGAGGAGAucuGuGACuUdTdT 299 AAGUCACAGAUCUCCUCuAdTdT AD-48898 AD-53870.1 251 uAGAGGAGAucuGuGACuUdTdT 300 AAGUcAcAGAUCUCcUcuAdTdT AD-48898 AD-53871.1 252 uAGAGGAGAucuGuGACuUdTdT 301 AAGUCACAGAUCUCCUcuAdTdT AD-48898 AD-53876.1 253 uAGAGGAGAucuGuGACuUdTdT 302 AAGUCAcAGAUCUCCUCuAdTdT AD-48898 AD-53877.1 254 uAGAGGAGAucuGuGACuUdTdT 303 AAGUCACAGAUCUCcUcuAdTdT AD-48898 AD-53882.1 255 uAGAGGAGAucuGuGACuUdTdT 304 AAGUCAcAGAUCUCCUcuAdTdT AD-48898 AD-53839.1 256 uAGAGGAGAucuGuGAcuudTdT 305 AAGUcAcAGAUCUCCUcuAdTdT AD-48898 AD-53845.1 257 uAGAGGAGAucuGuGAcuudTdT 306 AAGUcAcAGAUCUCcUcuAdTdT AD-48898 AD-53851.1 258 uAGAGGAGAucuGuGAcuudTdT 307 AAGUCAcAGAUCUCCUCuAdTdT AD-48898 AD-53857.1 259 uAGAGGAGAucuGuGAcuudTdT 308 AAGUCAcAGAUCUCCUcuAdTdT AD-48898 AD-53863.1 260 uAGAGGAGAucuGuGAcuudTdT 309 AAGUCAcAGAUCUCcUcuAdTdT AD-48898 AD-53869.1 261 uAGAGGAGAucuGuGAcuudTdT 310 AAGUCAcAGAUcUCcUcuAdTdT AD-48898 AD-56165.1 262 uAGAGGAGAucuGuGAcuudTdT 311 AAGUcAcAGAUCUCCUCuAdTdT AD-48898

TABLE 6 Efficacy screen with AD-48878 and AD-48898 lead optimization duplexes Avg Avg Avg Avg Avg SD SD SD SD SD Parent Duplex ID 10 nM 0.1 nM 0.1 nM 0.01 nM 0.001 nM 10 nM 0.10 nM1 0.1 nM2 0.01 nM 0.001 nM AD-48898 AD-53839.1 0.19 0.45 0.38 0.82 1.05 0.01 0.02 0.02 0.05 0.02 AD-48898 AD-53841.1 0.2 0.39 0.26 0.76 1.01 0.02 0.02 0.02 0.01 0.03 AD-48898 AD-53843.1 0.2 0.52 0.34 1.08 1.1 0.01 0.01 0.02 0.05 0.07 AD-48898 AD-53838.1 0.2 0.44 0.26 0.83 0.91 0.03 0.02 0.03 0.04 0.07 AD-48898 AD-53859.1 0.22 0.47 0.46 0.74 0.97 0.02 0.03 0.03 0.02 0.06 AD-48898 AD-53850.1 0.36 0.45 0.31 0.71 0.94 0.04 0.02 0.01 0.04 0.03 AD-48898 AD-53855.1 0.36 0.27 0.36 1.01 1.06 0.01 0.01 0.03 0.09 0.07 AD-48898 AD-53849.1 0.36 0.48 0.29 0.8 1.03 0.02 0.01 0 0.04 0.03 AD-48898 AD-53846.1 0.38 0.36 0.41 0.83 0.84 0.02 0 0.02 0.06 0.07 AD-48898 AD-53857.1 0.38 0.4 0.4 0.74 0.99 0.03 0.01 0.02 0.01 0.05 AD-48898 AD-53852.1 0.39 0.42 0.46 0.62 0.88 0.02 0.02 0.02 0.03 0.01 AD-48898 AD-53856.1 0.39 0.31 0.42 0.79 0.99 0.02 0.02 0.01 0.03 0.02 AD-48898 AD-53848.1 0.4 0.45 0.42 0.69 1.03 0.04 0.03 0.08 0.05 0.04 AD-48898 AD-53847.1 0.4 0.42 0.44 0.66 0.85 0.03 0.01 0.02 0.04 0.02 AD-48898 AD-53854.1 0.4 0.36 0.29 0.92 1.22 0.02 0.03 0.01 0.06 0.12 AD-48898 AD-53858.1 0.41 0.41 0.34 0.8 1.02 0.02 0.01 0 0.02 0.04 AD-48898 AD-53842.1 0.41 0.47 0.6 0.63 1.14 0.02 0.02 0.01 0.04 0.05 AD-48898 AD-53853.1 0.41 0.43 0.31 0.9 1.01 0.02 0.01 0.02 0.04 0.03 AD-48898 AD-53844.1 0.42 0.46 0.29 0.74 0.93 0.02 0.01 0.02 0.03 0.06 AD-48898 AD-53836.1 0.44 0.43 0.27 1 1.15 0.02 0.03 0.03 0.08 0.09 AD-48898 AD-53840.1 0.45 0.37 0.32 0.73 0.74 0.02 0 0.13 0.09 0.02 AD-48898 AD-53851.1 0.46 0.43 0.28 0.66 1.03 0.02 0.03 0.02 0.04 0.06 AD-48898 AD-53845.1 0.47 0.45 0.48 0.96 0.98 0.02 0.02 0.04 0.05 0.03 AD-48898 AD-53837.1 0.48 0.47 0.55 1.1 1.13 0.02 0.03 0.04 0.09 0.05 AD-48898 AD-53877.1 0.38 0.39 0.38 0.73 0.82 0.01 0.01 0.03 0.05 0.03 AD-48898 AD-53862.1 0.44 0.51 0.48 0.78 0.82 0.02 0.02 0.03 0.03 0.05 AD-48898 AD-53881.1 0.46 0.34 0.5 0.78 0.85 0.02 0.01 0.03 0.02 0.04 AD-48898 AD-53865.1 0.37 0.39 0.41 0.76 0.86 0.01 0.01 0.05 0.01 0.03 AD-48898 AD-53871.1 0.35 0.42 0.39 0.62 0.87 0.01 0.01 0.02 0.04 0.02 AD-48898 AD-53875.1 0.24 0.37 0.48 0.79 0.87 0.01 0.02 0.02 0.01 0.05 AD-48898 AD-53863.1 0.34 0.38 0.47 0.66 0.88 0.02 0.02 0.03 0.05 0.03 AD-48898 AD-53861.1 0.17 0.47 0.29 0.65 0.89 0.02 0.04 0.03 0.02 0.04 AD-48898 AD-53874.1 0.41 0.49 0.39 0.95 0.91 0.03 0.01 0.01 0.03 0.03 AD-48898 AD-53868.1 0.41 0.5 0.36 0.85 0.92 0.04 0.02 0.03 0.03 0.07 AD-48898 AD-53876.1 0.36 0.34 0.37 0.76 0.94 0.02 0.02 0.03 0.03 0.04 AD-48898 AD-53879.1 0.42 0.46 0.49 0.8 0.95 0.01 0.02 0.02 0.03 0.03 AD-48898 AD-53867.1 0.2 0.43 0.28 0.79 0.96 0.01 0.01 0.03 0.02 0.02 AD-48898 AD-53873.1 0.39 0.28 0.29 0.87 0.97 0.03 0.01 0.01 0.08 0.06 AD-48898 AD-53869.1 0.22 0.38 0.3 0.8 0.98 0.01 0.03 0.02 0.03 0.02 AD-48898 AD-53864.1 0.4 0.47 0.5 0.94 0.99 0.01 0.02 0.03 0.03 0.05 AD-48898 AD-53878.1 0.38 0.45 0.24 0.9 0.99 0.02 0.02 0 0.07 0.05 AD-48898 AD-53882.1 0.21 0.37 0.41 0.75 1.01 0.01 0.01 0.02 0.02 0.03 AD-48898 AD-53880.1 0.33 0.44 0.48 0.71 1.01 0.01 0.02 0.01 0.01 0.02 AD-48898 AD-53870.1 0.23 0.44 0.45 0.95 1.09 0.01 0.02 0.02 0.04 0.04 AD-48898 AD-53860.1 0.44 0.46 0.28 0.7 1.12 0.01 0.03 0.02 0.04 0.06 AD-48898 AD-53872.1 0.43 0.51 0.29 0.97 1.2 0.03 0.02 0.01 0.01 0.09 AD-48898 AD-53866.1 0.39 0.45 0.51 0.9 1.22 0.02 0.02 0.02 0.02 0.06

TABLE 7 Dose response screens with a subset of active AD- 48878 and AD-48898 lead optimization duplexes Parent Duplex ID IC50 (nM) AD-48878 AD-53836.1 0.3431 AD-48878 AD-53838.1 0.0828 AD-48878 AD-53841.1 0.0537 AD-48878 AD-53842.1 0.058 AD-48878 AD-53846.1 0.0465 AD-48878 AD-53847.1 0.08 AD-48878 AD-53851.1 0.0484 AD-48878 AD-53852.1 0.0333 AD-48878 AD-53854.1 0.0976 AD-48878 AD-53855.1 0.2547 AD-48878 AD-53856.1 0.0861 AD-48878 AD-48878.1 0.0021 AD-48878 AD-48878.1 0.0039 AD-48898 AD-53860.1 0.056 AD-48898 AD-53861.1 0.0308 AD-48898 AD-53863.1 0.1274 AD-48898 AD-53867.1 0.1066 AD-48898 AD-53869.1 0.0603 AD-48898 AD-53871.1 0.0471 AD-48898 AD-53872.1 0.0442 AD-48898 AD-53873.1 0.0527 AD-48898 AD-53876.1 0.0169 AD-48898 AD-53878.1 0.0836 AD-48898 AD-53881.1 0.0915 AD-48898 AD-48898.1 0.0054 AD-48898 AD-48898.1 0.0089

TABLE 8 PROC modified siRNA GalNac conjugates sequences Lowercase nucleotides (a, u, g, c) are 2′-O-methyl nucleotides; Nf (e.g., Af) is a 2′-fluoro nucleotide; s is a phosphothiorate linkage; L96 indicates a GalNAc ligand. SEQ SEQ Duplex ID ID name NO: Sense strand sequence NO: Antisense strand sequence AD-54994.1 312 AfgAfgGfaGfaUfCfUfgUfgAfcUfuCfgAfL96 357 uCfgAfaGfuCfaCfagaUfcUfcCfuCfusAfsu AD-54997.1 313 CfaAfcUfuCfaUfCfAfaGfaUfuCfcCfgUfL96 358 aCfgGfgAfaUfcUfugaUfgAfaGfuUfgsAfsg AD-54986.1 314 UfcCfuUfcAfcAfAfCfuAfcGfgCfgUfuUfL96 359 aAfaCfgCfcGfuAfguuGfuGfaAfgGfasGfsc AD-54985.1 315 CfaUfaGfaGfgAfGfAfuCfuGfuGfaCfuUfL96 360 aAfgUfcAfcAfgAfucuCfcUfcUfaUfgsCfsa AD-55018.1 316 AfaGfaAfgCfgCfAfGfuCfaCfcUfgAfaAfL96 361 uUfuCfaGfgUfgAfcugCfgCfuUfcUfusCfsu AD-55015.1 317 UfcCfuGfcUfgGfAfCfuCfaAfaGfaAfgAfL96 362 uCfuUfcUfuUfgAfgucCfaGfcAfgGfasCfsc AD-55001.1 318 GfuCfcUfcAfaCfUfUfcAfuCfaAfgAfuUfL96 363 aAfuCfuUfgAfuGfaagUfuGfaGfgAfcsGfsa AD-55020.1 319 CfcUfuCfaCfaAfCfUfaCfgGfcGfuUfuAfL96 364 uAfaAfcGfcCfgUfaguUfgUfgAfaGfgsAfsg AD-55012.1 320 CfcAfgCfgCfgAfGfGfuGfaGfcUfuCfcUfL96 365 aGfgAfaGfcUfcAfccuCfgCfgCfuGfgsCfsa AD-55003.1 321 UfuGfaCfuCfaGfUfGfuUfcUfcCfaGfcAfL96 366 uGfcUfgGfaGfaAfcacUfgAfgUfcAfasGfsa AD-55009.1 322 UfuCfgAfgGfaGfGfCfcAfaGfgAfaAfuUfL96 367 aAfuUfuCfcUfuGfgccUfcCfuCfgAfasGfsu AD-55016.1 323 UfuUfuCfcAfaAfAfUfgUfgGfaUfgAfcAfL96 368 uGfuCfaUfcCfaCfauuUfuGfgAfaAfasUfsu AD-54981.1 324 CfgAfgGfuCfaUfGfAfgCfaAfcAfuGfgUfL96 369 aCfcAfuGfuUfgCfucaUfgAfcCfuCfgsCfsu AD-55011.1 325 CfuUfgUfcAfgGfCfUfuGfgAfgAfgUfaUfL96 370 aUfaCfuCfuCfcAfagcCfuGfaCfaAfgsGfsa AD-54996.1 326 AfgGfcUfuGfgAfGfAfgUfaUfgAfcCfuGfL96 371 cAfgGfuCfaUfaCfucuCfcAfaGfcCfusGfsa AD-55014.1 327 GfaGfgGfgGfaUfAfCfuCfuGfuUfuAfuGfL96 372 cAfuAfaAfcAfgAfguaUfcCfcCfcUfcsAfsa AD-55006.1 328 CfuUfgGfuCfuUfGfCfcCfuUfgGfaGfcAfL96 373 uGfcUfcCfaAfgGfgcaAfgAfcCfaAfgsCfsa AD-55007.1 329 GfgGfcAfcAfuCfAfGfaGfaCfaAfgGfaAfL96 374 uUfcCfuUfgUfcUfcugAfuGfuGfcCfcsAfsu AD-54993.1 330 UfcAfuUfgAfuGfGfGfaAfgAfuGfaCfcAfL96 375 uGfgUfcAfuCfuUfcccAfuCfaAfuGfasGfsc AD-55008.1 331 UfcAfcAfaCfuAfCfGfgCfgUfuUfaCfaCfL96 376 gUfgUfaAfaCfgCfcguAfgUfuGfuGfasAfsg AD-54991.1 332 CfaAfuGfaGfuGfCfAfgCfgAfgGfuCfaUfL96 377 aUfgAfcCfuCfgCfugcAfcUfcAfuUfgsUfsg AD-54982.1 333 CfaAfcUfaCfgGfCfGfuUfuAfcAfcCfaAfL96 378 uUfgGfuGfuAfaAfcgcCfgUfaGfuUfgsUfsg AD-54983.1 334 AfgAfcCfaAfgAfAfGfaCfcAfaGfuAfgAfL96 379 uCfuAfcUfuGfgUfcuuCfuUfgGfuCfusUfsc AD-55005.1 335 GfgGfgGfaUfaCfUfCfuGfuUfuAfuGfaAfL96 380 uUfcAfuAfaAfcAfgagUfaUfcCfcCfcsUfsc AD-55013.1 336 GfgGfgAfuAfcUfCfUfgUfuUfaUfgAfaAfL96 381 uUfuCfaUfaAfaCfagaGfuAfuCfcCfcsCfsu AD-54979.1 337 GfuGfcAfgCfgAfGfGfuCfaUfgAfgCfaAfL96 382 uUfgCfuCfaUfgAfccuCfgCfuGfcAfcsUfsc AD-55022.1 338 UfuCfcAfaAfaUfGfUfgGfaUfgAfcAfcAfL96 383 uGfuGfuCfaUfcCfacaUfuUfuGfgAfasAfsa AD-55023.1 339 GfaAfgAfcCfaAfGfAfaGfaCfcAfaGfuAfL96 384 uAfcUfuGfgUfcUfucuUfgGfuCfuUfcsUfsg AD-55004.1 340 CfcUfgCfuGfgAfCfUfcAfaAfgAfaGfaAfL96 385 uUfcUfuCfuUfuGfaguCfcAfgCfaGfgsAfsc AD-54987.1 341 GfcUfgGfaCfuCfAfAfaGfaAfgAfaGfcUfL96 386 aGfcUfuCfuUfcUfuugAfgUfcCfaGfcsAfsg AD-54990.1 342 CfuGfcUfgGfaCfUfCfaAfaGfaAfgAfaGfL96 387 cUfuCfuUfcUfuUfgagUfcCfaGfcAfgsGfsa AD-54998.1 343 GfgUfgGfuCfcUfGfCfuGfgAfcUfcAfaAfL96 388 uUfuGfaGfuCfcAfgcaGfgAfcCfaCfcsUfsg AD-54984.1 344 AfaGfaCfcAfaGfAfAfgAfcCfaAfgUfaGfL96 389 cUfaCfuUfgGfuCfuucUfuGfgUfcUfusCfsu AD-54999.1 345 CfaGfgUfgCfuGfCfGfgAfuCfcGfcAfaAfL96 390 uUfuGfcGfgAfuCfcgcAfgCfaCfcUfgsGfsu AD-55000.1 346 GfgAfgAfuCfuGfUfGfaCfuUfcGfaGfgAfL96 391 uCfcUfcGfaAfgUfcacAfgAfuCfuCfcsUfsc AD-55010.1 347 CfcUfuGfuCfaGfGfCfuUfgGfaGfaGfuAfL96 392 uAfcUfcUfcCfaAfgccUfgAfcAfaGfgsAfsg AD-55024.1 348 AfaCfgAfgAfcAfCfAfgAfaGfaCfcAfaGfL96 393 cUfuGfgUfcUfuCfuguGfuCfuCfgUfusUfsc AD-54992.1 349 CfaUfgGfuGfuCfUfGfaGfaAfcAfuGfcUfL96 394 aGfcAfuGfuUfcUfcagAfcAfcCfaUfgsUfsu AD-54980.1 350 AfgUfcCfaAfgAfAfGfcUfcCfuUfgUfcAfL96 395 uGfaCfaAfgGfaGfcuuCfuUfgGfaCfusCfsa AD-55019.1 351 AfgAfaGfcGfcAfGfUfcAfcCfuGfaAfaCfL96 396 gUfuUfcAfgGfuGfacuGfcGfcUfuCfusUfsc AD-55021.1 352 AfgUfgCfaGfcGfAfGfgUfcAfuGfaGfcAfL96 397 uGfcUfcAfuGfaCfcucGfcUfgCfaCfusCfsa AD-54989.1 353 CfaGfgCfuUfgGfAfGfaGfuAfuGfaCfcUfL96 398 aGfgUfcAfuAfcUfcucCfaAfgCfcUfgsAfsc AD-54988.1 354 GfuUfcGfuGfgCfCfAfcCfuGfgGfgAfaUfL96 399 aUfuCfcCfcAfgGfuggCfcAfcGfaAfcsAfsg AD-55017.1 355 AfaUfuUfuCfcAfAfAfaUfgUfgGfaUfgAfL96 400 uCfaUfcCfaCfaUfuuuGfgAfaAfaUfusUfsc AD-54995.1 356 CfgCfcAfcCfcUfCfUfcGfcAfgAfcCfaUfL96 401 aUfgGfuCfuGfcGfagaGfgGfuGfgCfgsGfsg

TABLE 9 PROC siRNA GalNac conjugate: unmodified sequences The symbol “x” indicates that the sequence contains a GalNAc conjugate. Position Position SEQ in SEQ in Duplex ID NM_00031 ID NM_00031 name NO: Sense sequence 2.2 NO: Antisense sequence 2.2 AD-54994.1 402 AGAGGAGAUCUGUGACUUCGAx 253-273 447 UCGAAGUCACAGAUCUCCUCUAU 251-273 AD-54997.1 403 CAACUUCAUCAAGAUUCCCGUx 1153-1173 448 ACGGGAAUCUUGAUGAAGUUGAG 1151-1173 AD-54986.1 404 UCCUUCACAACUACGGCGUUUx 1356-1376 449 AAACGCCGUAGUUGUGAAGGAGC 1354-1376 AD-54985.1 405 CAUAGAGGAGAUCUGUGACUUx 250-270 450 AAGUCACAGAUCUCCUCUAUGCA 248-270 AD-55018.1 406 AAGAAGCGCAGUCACCUGAAAx 647-667 451 UUUCAGGUGACUGCGCUUCUUCU 645-667 AD-55015.1 407 UCCUGCUGGACUCAAAGAAGAx 756-776 452 UCUUCUUUGAGUCCAGCAGGACC 754-776 AD-55001.1 408 GUCCUCAACUUCAUCAAGAUUx 1148-1168 453 AAUCUUGAUGAAGUUGAGGACGA 1146-1168 AD-55020.1 409 CCUUCACAACUACGGCGUUUAx 1357-1377 454 UAAACGCCGUAGUUGUGAAGGAG 1355-1377 AD-55012.1 410 CCAGCGCGAGGUGAGCUUCCUx 466-486 455 AGGAAGCUCACCUCGCGCUGGCA 464-486 AD-55003.1 411 UUGACUCAGUGUUCUCCAGCAx 141-161 456 UGCUGGAGAACACUGAGUCAAGA 139-161 AD-55009.1 412 UUCGAGGAGGCCAAGGAAAUUx 269-289 457 AAUUUCCUUGGCCUCCUCGAAGU 267-289 AD-55016.1 413 UUUUCCAAAAUGUGGAUGACAx 288-308 458 UGUCAUCCACAUUUUGGAAAAUU 286-308 AD-54981.1 414 CGAGGUCAUGAGCAACAUGGUx 1195-1215 459 ACCAUGUUGCUCAUGACCUCGCU 1193-1215 AD-55011.1 415 CUUGUCAGGCUUGGAGAGUAUx 857-877 460 AUACUCUCCAAGCCUGACAAGGA 855-877 AD-54996.1 416 AGGCUUGGAGAGUAUGACCUGx 863-883 461 CAGGUCAUACUCUCCAAGCCUGA 861-883 AD-55014.1 417 GAGGGGGAUACUCUGUUUAUGx 1708-1728 462 CAUAAACAGAGUAUCCCCCUCAA 1706-1728 AD-55006.1 418 CUUGGUCUUGCCCUUGGAGCAx 349-369 463 UGCUCCAAGGGCAAGACCAAGCA 347-369 AD-55007.1 419 GGGCACAUCAGAGACAAGGAAx 1412-1432 464 UUCCUUGUCUCUGAUGUGCCCAU 1410-1432 AD-54993.1 420 UCAUUGAUGGGAAGAUGACCAx 708-728 465 UGGUCAUCUUCCCAUCAAUGAGC 706-728 AD-55008.1 421 UCACAACUACGGCGUUUACACx 1360-1380 466 GUGUAAACGCCGUAGUUGUGAAG 1358-1380 AD-54991.1 422 CAAUGAGUGCAGCGAGGUCAUx 1183-1203 467 AUGACCUCGCUGCACUCAUUGUG 1181-1203 AD-54982.1 423 CAACUACGGCGUUUACACCAAx 1363-1383 468 UUGGUGUAAACGCCGUAGUUGUG 1361-1383 AD-54983.1 424 AGACCAAGAAGACCAAGUAGAx 679-699 469 UCUACUUGGUCUUCUUGGUCUUC 677-699 AD-55005.1 425 GGGGGAUACUCUGUUUAUGAAx 1710-1730 470 UUCAUAAACAGAGUAUCCCCCUC 1708-1730 AD-55013.1 426 GGGGAUACUCUGUUUAUGAAAx 1711-1731 471 UUUCAUAAACAGAGUAUCCCCCU 1709-1731 AD-54979.1 427 GUGCAGCGAGGUCAUGAGCAAx 1189-1209 472 UUGCUCAUGACCUCGCUGCACUC 1187-1209 AD-55022.1 428 UUCCAAAAUGUGGAUGACACAx 290-310 473 UGUGUCAUCCACAUUUUGGAAAA 288-310 AD-55023.1 429 GAAGACCAAGAAGACCAAGUAx 677-697 474 UACUUGGUCUUCUUGGUCUUCUG 675-697 AD-55004.1 430 CCUGCUGGACUCAAAGAAGAAx 757-777 475 UUCUUCUUUGAGUCCAGCAGGAC 755-777 AD-54987.1 431 GCUGGACUCAAAGAAGAAGCUx 760-780 476 AGCUUCUUCUUUGAGUCCAGCAG 758-780 AD-54990.1 432 CUGCUGGACUCAAAGAAGAAGx 758-778 477 CUUCUUCUUUGAGUCCAGCAGGA 756-778 AD-54998.1 433 GGUGGUCCUGCUGGACUCAAAx 751-771 478 UUUGAGUCCAGCAGGACCACCUG 749-771 AD-54984.1 434 AAGACCAAGAAGACCAAGUAGx 678-698 479 CUACUUGGUCUUCUUGGUCUUCU 676-698 AD-54999.1 435 CAGGUGCUGCGGAUCCGCAAAx 176-196 480 UUUGCGGAUCCGCAGCACCUGGU 174-196 AD-55000.1 436 GGAGAUCUGUGACUUCGAGGAx 256-276 481 UCCUCGAAGUCACAGAUCUCCUC 254-276 AD-55010.1 437 CCUUGUCAGGCUUGGAGAGUAx 856-876 482 UACUCUCCAAGCCUGACAAGGAG 854-876 AD-55024.1 438 AACGAGACACAGAAGACCAAGx 666-686 483 CUUGGUCUUCUGUGUCUCGUUUC 664-686 AD-54992.1 439 CAUGGUGUCUGAGAACAUGCUx 1210-1230 484 AGCAUGUUCUCAGACACCAUGUU 1208-1230 AD-54980.1 440 AGUCCAAGAAGCUCCUUGUCAx 843-863 485 UGACAAGGAGCUUCUUGGACUCA 841-863 AD-55019.1 441 AGAAGCGCAGUCACCUGAAACx 648-668 486 GUUUCAGGUGACUGCGCUUCUUC 646-668 AD-55021.1 442 AGUGCAGCGAGGUCAUGAGCAx 1188-1208 487 UGCUCAUGACCUCGCUGCACUCA 1186-1208 AD-54989.1 443 CAGGCUUGGAGAGUAUGACCUx 862-882 488 AGGUCAUACUCUCCAAGCCUGAC 860-882 AD-54988.1 444 GUUCGUGGCCACCUGGGGAAUx 100-120 489 AUUCCCCAGGUGGCCACGAACAG  98-120 AD-55017.1 445 AAUUUUCCAAAAUGUGGAUGAx 286-306 490 UCAUCCACAUUUUGGAAAAUUUC 284-306 AD-54995.1 446 CGCCACCCUCUCGCAGACCAUx  997-1017  491 AUGGUCUGCGAGAGGGUGGCGGG  995-1017

TABLE 10 PROC siRNA GalNac conjugate efficacy screened by free-uptake DUPLEX ID Avg 100 nM Avg 10 nM Avg 0.1 nM SD 100 nM SD 10 nM SD 0.1 nM AD-54994.1 0.52 0.81 0.97 0.02 0.06 0.06 AD-54997.1 0.58 0.69 1.06 0.02 0 0 AD-54986.1 0.62 0.83 0.91 0.02 0.02 0.01 AD-54985.1 0.73 0.66 0.96 0.06 0.01 0.06 AD-55018.1 0.74 0.95 0.96 0.01 0.01 0.09 AD-55015.1 0.85 0.85 1.05 0.02 0.01 0.06 AD-55001.1 0.85 0.97 0.99 0.01 0.05 0 AD-55020.1 0.86 0.91 1.07 0.04 0.03 0 AD-55012.1 0.86 0.86 0.86 0.01 0.03 0.05 AD-55003.1 0.86 0.84 0.94 0.1 0.01 0.02 AD-55009.1 0.87 0.74 0.93 0 0.01 0.02 AD-55016.1 0.89 1.02 1.09 0.02 0.01 0.02 AD-54981.1 0.89 0.9 1 0.03 0.03 0.01 AD-55011.1 0.9 0.95 1.09 0.02 0.08 0.04 AD-54996.1 0.92 0.89 0.87 0 0.03 0.04 AD-55014.1 0.93 0.93 1.02 0.01 0.03 0 AD-55006.1 0.94 0.87 0.86 0.03 0.07 0 AD-55007.1 0.95 0.89 0.95 0.02 0.02 0.06 AD-54993.1 0.96 0.87 0.9 0 0.02 0 AD-55008.1 0.98 1.07 0.92 0.01 0.05 0.02 AD-54991.1 0.99 0.9 1.02 0.04 0.05 0.02 AD-54982.1 0.99 0.93 1.06 0.06 0.01 0.07 AD-54983.1 1 1.1 0.9 0.07 0.04 0.03 AD-55005.1 1.02 1.04 0.94 0.06 0.03 0.03 AD-55013.1 1.03 0.93 0.99 0.02 0.03 0.09 AD-54979.1 1.03 1.08 0.98 0.07 0.03 0.04 AD-55022.1 1.04 0.93 0.92 0.01 0 0.01 AD-55023.1 1.05 1.05 0.87 0.01 0.08 0.05 AD-55004.1 1.06 0.9 1.03 0.05 0.02 0.01 AD-54987.1 1.06 0.98 0.91 0.03 0.08 0.04 AD-54990.1 1.07 0.88 0.89 0.01 0.02 0.02 AD-54998.1 1.07 0.93 0.99 0.13 0.01 0.02 AD-54984.1 1.09 0.96 0.89 0 0.02 0.02 AD-54999.1 1.09 1.08 0.93 0.04 0 0.01 AD-55000.1 1.1 0.91 0.94 0.01 0.02 0.08 AD-55010.1 1.1 0.89 0.98 0.02 0.01 0.05 AD-55024.1 1.11 0.95 1.09 0.01 0.02 0.03 AD-54992.1 1.11 0.94 1.02 0.06 0.01 0 AD-54980.1 1.13 0.99 1.02 0.01 0.01 0.01 AD-55019.1 1.16 0.89 0.95 0.02 0 0.07 AD-55021.1 1.19 0.91 0.94 0.02 0.02 0.01 AD-54989.1 1.19 0.95 1.08 0.02 0.07 0.03 AD-54988.1 1.22 1.02 0.98 0.01 0.09 0.04 AD-55017.1 1.24 0.96 0.93 0.05 0.01 0.06 AD-54995.1 1.27 0.99 0.94 0.04 0.02 0.04

TABLE 11 PROC siRNA GalNac conjugate efficacy screened by transfection with RNAiMax DUPLEX ID avg 100 nM avg 10 nM avg 0.1 nM SD 100 nM SD 10 nM SD 0.1 nM AD-55018.1 0.26 0.23 0.68 0.029 0.003 0.028 AD-54997.1 0.25 0.23 0.84 0.019 0.006 0.001 AD-54994.1 0.26 0.24 0.51 0.035 0.006 0.042 AD-55001.1 0.33 0.26 0.72 0.029 0.000 0.031 AD-54986.1 0.31 0.27 0.78 0.029 0.004 0.017 AD-54998.1 0.40 0.28 0.86 0.024 0.028 0.009 AD-54985.1 0.32 0.28 0.86 0.047 0.040 0.048 AD-54987.1 0.25 0.29 0.84 0.009 0.010 0.044 AD-55023.1 0.29 0.29 1.03 0.004 0.031 0.027 AD-55011.1 0.34 0.31 0.80 0.015 0.012 0.028 AD-55003.1 0.35 0.32 0.80 0.045 0.002 0.017 AD-55016.1 0.34 0.33 0.86 0.032 0.034 0.089 AD-55004.1 0.64 0.33 0.83 0.051 0.013 0.018 AD-54979.1 0.46 0.34 0.89 0.044 0.006 0.044 AD-55024.1 0.40 0.34 0.98 0.012 0.004 0.031 AD-54996.1 0.44 0.36 0.96 0.019 0.008 0.053 AD-55010.1 0.36 0.37 0.89 0.016 0.047 0.013 AD-54993.1 0.39 0.39 0.93 0.004 0.001 0.042 AD-55000.1 0.41 0.40 0.92 0.015 0.032 0.017 AD-55012.1 0.25 0.40 0.92 0.014 0.009 0.030 AD-54991.1 0.36 0.41 0.98 0.023 0.014 0.038 AD-55009.1 0.50 0.41 1.09 0.024 0.061 0.011 AD-55007.1 0.44 0.41 0.81 0.012 0.003 0.058 AD-54992.1 0.34 0.41 0.92 0.028 0.001 0.083 AD-54981.1 0.33 0.42 1.06 0.012 0.018 0.025 AD-55022.1 0.40 0.43 0.74 0.007 0.053 0.012 AD-54984.1 0.41 0.44 1.02 0.005 0.004 0.014 AD-54990.1 0.28 0.45 0.98 0.014 0.019 0.108 AD-54980.1 0.63 0.48 0.95 0.036 0.010 0.034 AD-55015.1 0.44 0.49 0.91 0.007 0.051 0.002 AD-54983.1 0.37 0.49 0.86 0.015 0.032 0.035 AD-55014.1 0.75 0.51 0.81 0.038 0.002 0.045 AD-54982.1 0.76 0.54 0.98 0.066 0.069 0.013 AD-55019.1 0.58 0.55 0.93 0.016 0.015 0.041 AD-55006.1 0.47 0.55 0.95 0.032 0.062 0.004 AD-55008.1 0.97 0.57 1.14 0.037 0.002 0.038 AD-55005.1 0.72 0.63 0.86 0.010 0.064 0.030 AD-54989.1 0.64 0.63 0.90 0.012 0.056 0.032 AD-55020.1 0.66 0.64 0.88 0.004 0.029 0.006 AD-55013.1 0.73 0.69 0.63 0.030 0.016 0.010 AD-55017.1 0.68 0.73 0.98 0.044 0.002 0.005 AD-54988.1 0.72 0.73 1.04 0.075 0.037 0.002 AD-54995.1 0.88 0.75 0.83 0.027 0.021 0.030 AD-55021.1 0.88 0.79 0.94 0.037 0.003 0.017 AD-54999.1 0.84 0.81 0.95 0.001 0.028 0.034 AD-1955 1.00 0.96 0.97 0.019 0.022 0.023 AD-1955 0.94 1.00 1.01 0.020 0.023 0.003 AD-1955 1.06 1.05 1.02 0.003 0.000 0.027

SEQ ID NO: 1 NCBI Reference Sequence: NM_000312.2, Homo sapiens Protein C (PROC), mRNA    1 atggattaac tcgaactcca ggctgtcatg gcggcaggac ggcgaacttg cagtatctcc   61 acgacccgcc cctacaggtg ccagtgcctc cagaatgtgg cagctcacaa gcctcctgct  121 gttcgtggcc acctggggaa tttccggcac accagctcct cttgactcag tgttctccag  181 cagcgagcgt gcccaccagg tgctgcggat ccgcaaacgt gccaactcct tcctggagga  241 gctccgtcac agcagcctgg agcgggagtg catagaggag atctgtgact tcgaggaggc  301 caaggaaatt ttccaaaatg tggatgacac actggccttc tggtccaagc acgtcgacgg  361 tgaccagtgc ttggtcttgc ccttggagca cccgtgcgcc agcctgtgct gcgggcacgg  421 cacgtgcatc gacggcatcg gcagcttcag ctgcgactgc cgcagcggct gggagggccg  481 cttctgccag cgcgaggtga gcttcctcaa ttgctcgctg gacaacggcg gctgcacgca  541 ttactgccta gaggaggtgg gctggcggcg ctgtagctgt gcgcctggct acaagctggg  601 ggacgacctc ctgcagtgtc accccgcagt gaagttccct tgtgggaggc cctggaagcg  661 gatggagaag aagcgcagtc acctgaaacg agacacagaa gaccaagaag accaagtaga  721 tccgcggctc attgatggga agatgaccag gcggggagac agcccctggc aggtggtcct  781 gctggactca aagaagaagc tggcctgcgg ggcagtgctc atccacccct cctgggtgct  841 gacagcggcc cactgcatgg atgagtccaa gaagctcctt gtcaggcttg gagagtatga  901 cctgcggcgc tgggagaagt gggagctgga cctggacatc aaggaggtct tcgtccaccc  961 caactacagc aagagcacca ccgacaatga catcgcactg ctgcacctgg cccagcccgc 1021 caccctctcg cagaccatag tgcccatctg cctcccggac agcggccttg cagagcgcga 1081 gctcaatcag gccggccagg agaccctcgt gacgggctgg ggctaccaca gcagccgaga 1141 gaaggaggcc aagagaaacc gcaccttcgt cctcaacttc atcaagattc ccgtggtccc 1201 gcacaatgag tgcagcgagg tcatgagcaa catggtgtct gagaacatgc tgtgtgcggg 1261 catcctcggg gaccggcagg atgcctgcga gggcgacagt ggggggccca tggtcgcctc 1321 cttccacggc acctggttcc tggtgggcct ggtgagctgg ggtgagggct gtgggctcct 1381 tcacaactac ggcgtttaca ccaaagtcag ccgctacctc gactggatcc atgggcacat 1441 cagagacaag gaagcccccc agaagagctg ggcaccttag cgaccctccc tgcagggctg 1501 ggcttttgca tggcaatgga tgggacatta aagggacatg taacaagcac accggcctgc 1561 tgttctgtcc ttccatccct cttttgggct cttctggagg gaagtaacat ttactgagca 1621 cctgttgtat gtcacatgcc ttatgaatag aatcttaact cctagagcaa ctctgtgggg 1681 tggggaggag cagatccaag ttttgcgggg tctaaagctg tgtgtgttga gggggatact 1741 ctgtttatga aaaagaataa aaaacacaac cacgaagcca aaaaaaaaaa SEQ ID NO: 492 NCBI Reference Sequence: NM_001042767.1, Mus muscularis Protein C (PROC), mRNA    l gggagagaac tgaccttttg aacgaagtcg gaagtagtgg aagcagaggg gagccgcgta   61 tttgacaggt gtcagcagct ccaggatgtg gcaattcaga gtcttcctgc tgctcatgtc  121 cacctgggga atatctagca taccggccca tcctgaccca gtgttctcca gcagcgagca  181 tgcccaccag gtgcttcggg tcagacgtgc caacagcttc ctggaagaga tgcggccagg  241 cagcctggaa cgggagtgta tggaggagat ctgtgacttc gaggaggccc aggagatttt  301 ccaaaatgtg gaagacacac tggccttctg gatcaagtac tttgacggtg accagtgctc  361 ggctccaccc ttggaccacc agtgcgacag cccatgctgc gggcatggca cttgcatcga  421 cggcataggc agcttcagct gcagctgcga taagggctgg gagggcaagt tctgtcagca  481 ggagttgcgc ttccaggact gtcgggtgaa caatggcggc tgcttgcact actgcctgga  541 ggagagcaat gggcggcgct gcgcttgtgc cccgggctat gagctggcag acgaccacat  601 gcgctgcaag tccactgtga attttccatg tgggaaactg gggaggtgga tagagaagaa  661 acgcaagatc ctcaaacgag acacagactt agaagatgaa ctggaaccag atccaaggat  721 agtcaacgga acgctgacga agcagggtga cagtccttgg caggcaatcc ttctggactc  781 caagaagaag ctggcctgcg gaggggtgct catccacact tcctgggtgc tgacggcagc  841 ccactgcgtg gagggcacca agaagcttac cgtgaggctt ggtgagtatg atctgcgacg  901 cagggaccac tgggagctgg acctggacat caaggagatc ctcgtccacc ctaactacac  961 ccggagcagc agtgacaacg acattgctct gctccgccta gcccagccag ccactctctc 1021 caaaaccata gtgcccatct gcctgccgaa caatgggctg gcgcaggagc tcactcaggc 1081 tggccaggag acagtggtga caggctgggg ctatcaaagc gacagaatca aggatggcag 1141 aaggaaccgc accttcatcc tcaccttcat ccgcatccct ttggttgctc gaaatgagtg 1201 cgtggaggtc atgaagaatg tggtctcgga gaacatgctg tgtgcaggca tcattgggga 1261 cacgagagac gcctgtgatg gtgacagtgg ggggcccatg gtggtcttct ttcggggtac 1321 ctggttcctg gtgggcctgg tgagctgggg tgagggctgt gggcacacca acaactatgg 1381 catctacacc aaagtgggaa gctacctcaa atggattcac agttacattg gggaaaaggg 1441 tgtctccctt aagagccaga agctatagca cccctccctg ctcacctctg gaccctagaa 1501 gtcactcttg gagtaaggct gggctagtga gtaccaagac agaggacatt aaaggagcat 1561 gcaacaaaca taaaaaaaaa aaaa 

We claim:
 1. A double-stranded ribonucleic acid (dsRNA) for inhibiting expression of a Protein C (PROC) gene, wherein the dsRNA comprises a sense strand and an antisense strand each 30 nucleotides or less in length, wherein the antisense strand is complementary to at least 15 contiguous nucleotides of SEQ ID NO:
 108. 2. The dsRNA of claim 1, wherein the antisense strand comprises SEQ ID NO:
 162. 3. The dsRNA of claim 1, wherein the sense strand consists of the sequence of SEQ ID NO:108 and the antisense strand consists of the sequence of SEQ ID NO:162.
 4. The dsRNA of claim 1 or 2 or 3, wherein at least one nucleotide of the dsRNA is a modified nucleotide.
 5. The dsRNA of claim 4, wherein the modified nucleotide is chosen from the group consisting of: a 2′-O-methyl modified nucleotide, a nucleotide comprising a 5′-phosphorothioate group, and a terminal nucleotide linked to a cholesteryl derivative or dodecanoic acid bisdecylamide group.
 6. The dsRNA of claim 4, wherein the modified nucleotide is chosen from the group consisting of: a 2′-deoxy-2′-fluoro modified nucleotide, a 2′-deoxy-modified nucleotide, a locked nucleotide, an abasic nucleotide, 2′-amino-modified nucleotide, 2′-alkyl-modified nucleotide, morpholino nucleotide, a phosphoramidate, and a non-natural base comprising nucleotide.
 7. The dsRNA of claim 1 or 2, wherein at least one strand comprises a 3′ overhang of at least 1 nucleotide.
 8. The dsRNA of claim 1 or 2, wherein each strand comprises a 3′ overhang of at 2 nucleotides.
 9. The dsRNA of claim 1 or 2 or 3, further comprising a ligand.
 10. The dsRNA of claim 9, wherein the ligand is conjugated to the 3′ end of the sense strand of the dsRNA.
 11. The dsRNA of claim 1 or 2 or 3, further comprising at least one N-Acetyl-Galactosamine.
 12. A cell comprising the dsRNA of claim 1 or 2 or
 3. 13. A vector encoding at least one strand of the dsRNA of claim 1 or 2 or
 3. 14. A cell comprising the vector of claim
 13. 15. A pharmaceutical composition for inhibiting expression of a PROC gene comprising the dsRNA of claim 1 or 2 or
 3. 16. The pharmaceutical composition of claim 15, comprising a lipid formulation.
 17. The pharmaceutical composition of claim 15, comprising a lipid formulation comprising MC3.
 18. A method of inhibiting PROC expression in a cell, the method comprising: (a) contacting the cell with the dsRNA of claim 1 or 2 or 3; and (b) maintaining the cell produced in step (a) for a time sufficient to obtain degradation of the mRNA transcript of the PROC gene, thereby inhibiting expression of the PROC gene in the cell.
 19. The method of claim 18, wherein the PROC expression is inhibited by at least 30%.
 20. A method of treating a disorder mediated by PROC expression comprising administering to a human in need of such treatment a therapeutically effective amount of the PROC dsRNA of claim
 1. 21. The method of claim 20, wherein the disorder is a bleeding disorder.
 22. The method of claim 20, wherein the disorder is hemophelia.
 23. The method of claim 20, wherein administration causes an increase in blood clotting and/or a decrease in PROC protein accumulation.
 24. The method of claim 20, wherein the dsRNA is administered at a dose of about 0.01 mg/kg to about 10 mg/kg or about 0.5 mg/kg to about 50 mg/kg. 